What is the “determinant” of two vectors?Inversion of Hopf's UmlaufsatzWhat does the definition of curvature mean?Calculate the determinant when the sum of odd rows $=$ the sum of even rowsWhat does the notation $P[Xin dx]$ mean?Relations between curvature and area of simple closed plane curves.Prove the curvature of a level set equals divergence of the normalized gradientDefine a parametrized curve $beta:(a,b)rightarrowmathbb R^3$ by $beta(t)=fracdgamma(t)dt$Understanding a particular case of modifying curvature and torsion as opposed to modifying the curveIntegral of the ratio of torsion and curvatureProve that the planar curve obtained by projecting $alpha$ into its osculating plane at $P$ has the same curvature at $P$ as $alpha$.

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What is the “determinant” of two vectors?


Inversion of Hopf's UmlaufsatzWhat does the definition of curvature mean?Calculate the determinant when the sum of odd rows $=$ the sum of even rowsWhat does the notation $P[Xin dx]$ mean?Relations between curvature and area of simple closed plane curves.Prove the curvature of a level set equals divergence of the normalized gradientDefine a parametrized curve $beta:(a,b)rightarrowmathbb R^3$ by $beta(t)=fracdgamma(t)dt$Understanding a particular case of modifying curvature and torsion as opposed to modifying the curveIntegral of the ratio of torsion and curvatureProve that the planar curve obtained by projecting $alpha$ into its osculating plane at $P$ has the same curvature at $P$ as $alpha$.













5












$begingroup$


I came across the notation $det(v,w)$ where $v$ and $w$ are vectors. Specifically, it was about the curvature of a plane curve:



$$kappa (t) = fracdet(gamma'(t), gamma''(t)) $$



What is it supposed to mean?










share|cite|improve this question









$endgroup$











  • $begingroup$
    Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
    $endgroup$
    – Minus One-Twelfth
    7 hours ago











  • $begingroup$
    @MinusOne-Twelfth yes
    $endgroup$
    – user
    7 hours ago










  • $begingroup$
    That is the determinant of their components.
    $endgroup$
    – Bernard
    7 hours ago















5












$begingroup$


I came across the notation $det(v,w)$ where $v$ and $w$ are vectors. Specifically, it was about the curvature of a plane curve:



$$kappa (t) = fracdet(gamma'(t), gamma''(t)) $$



What is it supposed to mean?










share|cite|improve this question









$endgroup$











  • $begingroup$
    Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
    $endgroup$
    – Minus One-Twelfth
    7 hours ago











  • $begingroup$
    @MinusOne-Twelfth yes
    $endgroup$
    – user
    7 hours ago










  • $begingroup$
    That is the determinant of their components.
    $endgroup$
    – Bernard
    7 hours ago













5












5








5


1



$begingroup$


I came across the notation $det(v,w)$ where $v$ and $w$ are vectors. Specifically, it was about the curvature of a plane curve:



$$kappa (t) = fracdet(gamma'(t), gamma''(t)) $$



What is it supposed to mean?










share|cite|improve this question









$endgroup$




I came across the notation $det(v,w)$ where $v$ and $w$ are vectors. Specifically, it was about the curvature of a plane curve:



$$kappa (t) = fracdet(gamma'(t), gamma''(t)) $$



What is it supposed to mean?







linear-algebra differential-geometry notation determinant






share|cite|improve this question













share|cite|improve this question











share|cite|improve this question




share|cite|improve this question










asked 7 hours ago









useruser

613




613











  • $begingroup$
    Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
    $endgroup$
    – Minus One-Twelfth
    7 hours ago











  • $begingroup$
    @MinusOne-Twelfth yes
    $endgroup$
    – user
    7 hours ago










  • $begingroup$
    That is the determinant of their components.
    $endgroup$
    – Bernard
    7 hours ago
















  • $begingroup$
    Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
    $endgroup$
    – Minus One-Twelfth
    7 hours ago











  • $begingroup$
    @MinusOne-Twelfth yes
    $endgroup$
    – user
    7 hours ago










  • $begingroup$
    That is the determinant of their components.
    $endgroup$
    – Bernard
    7 hours ago















$begingroup$
Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
$endgroup$
– Minus One-Twelfth
7 hours ago





$begingroup$
Are they 2D vectors? You may want to see this section of the Wikipedia article on Curvature. As you should be able to see from there, $colorbluedet(v,w)$ means $colorbluedet beginpmatrix v_1 & w_1 \ v_2 & w_2endpmatrix$.
$endgroup$
– Minus One-Twelfth
7 hours ago













$begingroup$
@MinusOne-Twelfth yes
$endgroup$
– user
7 hours ago




$begingroup$
@MinusOne-Twelfth yes
$endgroup$
– user
7 hours ago












$begingroup$
That is the determinant of their components.
$endgroup$
– Bernard
7 hours ago




$begingroup$
That is the determinant of their components.
$endgroup$
– Bernard
7 hours ago










3 Answers
3






active

oldest

votes


















2












$begingroup$

They formed a matrix by stacking $gamma'(t)$ and $gamma''(t)$ next to each other as column vectors. You can also regard it as the cross product of the two vectors if you extend both with a $z=0$ coordinate and take the z component of the resulting vector (that way you can relate it to the 3d formula in a way).






share|cite|improve this answer









$endgroup$




















    1












    $begingroup$

    In general, the determinant of $n$ vectors $v_1$, $v_2$, $dots$, $v_n$ in $mathbb R^n$ is the determinant of the matrix whose columns are $v_1$, $dots$, $v_n$ (in that order).



    Seen as an application whose inputs are vectors, the determinant has nice properties:



    1. multilinear, that is linear in each variable:
      $$det(v_1,dots, a v_j+b w_j,dots,v_n)
      =
      a det(v_1,dots, v_j,dots,v_n)
      + bdet(v_1,dots, w_j,dots,v_n)$$


    2. alternating: switching two vectors transforms the determinant in its opposite


    $$det(v_1,dots, v_i, dots, v_j,dots,v_n) = det(v_1,dots, v_j, dots, v_i,dots,v_n)$$



    1. The value on the canonical basis $(e_1,dots,e_n)$ of $mathbb R^n$ is $1$.

    $$det(e_1,dots,e_n) = 1 $$



    Actually, it can be proved that the determinant is the unique alternating multilinear form whose value on the canonical basis is $1$. Many (most?) Linear Algebra books use this as a definition of the determinant (before extending the definition to matrices and then linear applications). I think it is equivalent but more satisfying than introducing the determinant by the strange "expansion along a row" formula most PreCalculus textbook use.






    share|cite|improve this answer









    $endgroup$








    • 2




      $begingroup$
      I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
      $endgroup$
      – lightxbulb
      5 hours ago



















    1












    $begingroup$

    Vectors in a plane $v,w$ can be written as column matrices: $$v=beginbmatrixv_1\v_2endbmatrix, w=beginbmatrixw_1\w_2endbmatrix.$$ Put several of such column matrices side by side, and you get a square matrix: $$(v,w)=beginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$ The determinant $det(v,w)$ is simply the determinant of this square matrix: $$det(v,w)=detbeginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$






    share|cite|improve this answer









    $endgroup$












      Your Answer





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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2












      $begingroup$

      They formed a matrix by stacking $gamma'(t)$ and $gamma''(t)$ next to each other as column vectors. You can also regard it as the cross product of the two vectors if you extend both with a $z=0$ coordinate and take the z component of the resulting vector (that way you can relate it to the 3d formula in a way).






      share|cite|improve this answer









      $endgroup$

















        2












        $begingroup$

        They formed a matrix by stacking $gamma'(t)$ and $gamma''(t)$ next to each other as column vectors. You can also regard it as the cross product of the two vectors if you extend both with a $z=0$ coordinate and take the z component of the resulting vector (that way you can relate it to the 3d formula in a way).






        share|cite|improve this answer









        $endgroup$















          2












          2








          2





          $begingroup$

          They formed a matrix by stacking $gamma'(t)$ and $gamma''(t)$ next to each other as column vectors. You can also regard it as the cross product of the two vectors if you extend both with a $z=0$ coordinate and take the z component of the resulting vector (that way you can relate it to the 3d formula in a way).






          share|cite|improve this answer









          $endgroup$



          They formed a matrix by stacking $gamma'(t)$ and $gamma''(t)$ next to each other as column vectors. You can also regard it as the cross product of the two vectors if you extend both with a $z=0$ coordinate and take the z component of the resulting vector (that way you can relate it to the 3d formula in a way).







          share|cite|improve this answer












          share|cite|improve this answer



          share|cite|improve this answer










          answered 7 hours ago









          lightxbulblightxbulb

          1,115311




          1,115311





















              1












              $begingroup$

              In general, the determinant of $n$ vectors $v_1$, $v_2$, $dots$, $v_n$ in $mathbb R^n$ is the determinant of the matrix whose columns are $v_1$, $dots$, $v_n$ (in that order).



              Seen as an application whose inputs are vectors, the determinant has nice properties:



              1. multilinear, that is linear in each variable:
                $$det(v_1,dots, a v_j+b w_j,dots,v_n)
                =
                a det(v_1,dots, v_j,dots,v_n)
                + bdet(v_1,dots, w_j,dots,v_n)$$


              2. alternating: switching two vectors transforms the determinant in its opposite


              $$det(v_1,dots, v_i, dots, v_j,dots,v_n) = det(v_1,dots, v_j, dots, v_i,dots,v_n)$$



              1. The value on the canonical basis $(e_1,dots,e_n)$ of $mathbb R^n$ is $1$.

              $$det(e_1,dots,e_n) = 1 $$



              Actually, it can be proved that the determinant is the unique alternating multilinear form whose value on the canonical basis is $1$. Many (most?) Linear Algebra books use this as a definition of the determinant (before extending the definition to matrices and then linear applications). I think it is equivalent but more satisfying than introducing the determinant by the strange "expansion along a row" formula most PreCalculus textbook use.






              share|cite|improve this answer









              $endgroup$








              • 2




                $begingroup$
                I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
                $endgroup$
                – lightxbulb
                5 hours ago
















              1












              $begingroup$

              In general, the determinant of $n$ vectors $v_1$, $v_2$, $dots$, $v_n$ in $mathbb R^n$ is the determinant of the matrix whose columns are $v_1$, $dots$, $v_n$ (in that order).



              Seen as an application whose inputs are vectors, the determinant has nice properties:



              1. multilinear, that is linear in each variable:
                $$det(v_1,dots, a v_j+b w_j,dots,v_n)
                =
                a det(v_1,dots, v_j,dots,v_n)
                + bdet(v_1,dots, w_j,dots,v_n)$$


              2. alternating: switching two vectors transforms the determinant in its opposite


              $$det(v_1,dots, v_i, dots, v_j,dots,v_n) = det(v_1,dots, v_j, dots, v_i,dots,v_n)$$



              1. The value on the canonical basis $(e_1,dots,e_n)$ of $mathbb R^n$ is $1$.

              $$det(e_1,dots,e_n) = 1 $$



              Actually, it can be proved that the determinant is the unique alternating multilinear form whose value on the canonical basis is $1$. Many (most?) Linear Algebra books use this as a definition of the determinant (before extending the definition to matrices and then linear applications). I think it is equivalent but more satisfying than introducing the determinant by the strange "expansion along a row" formula most PreCalculus textbook use.






              share|cite|improve this answer









              $endgroup$








              • 2




                $begingroup$
                I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
                $endgroup$
                – lightxbulb
                5 hours ago














              1












              1








              1





              $begingroup$

              In general, the determinant of $n$ vectors $v_1$, $v_2$, $dots$, $v_n$ in $mathbb R^n$ is the determinant of the matrix whose columns are $v_1$, $dots$, $v_n$ (in that order).



              Seen as an application whose inputs are vectors, the determinant has nice properties:



              1. multilinear, that is linear in each variable:
                $$det(v_1,dots, a v_j+b w_j,dots,v_n)
                =
                a det(v_1,dots, v_j,dots,v_n)
                + bdet(v_1,dots, w_j,dots,v_n)$$


              2. alternating: switching two vectors transforms the determinant in its opposite


              $$det(v_1,dots, v_i, dots, v_j,dots,v_n) = det(v_1,dots, v_j, dots, v_i,dots,v_n)$$



              1. The value on the canonical basis $(e_1,dots,e_n)$ of $mathbb R^n$ is $1$.

              $$det(e_1,dots,e_n) = 1 $$



              Actually, it can be proved that the determinant is the unique alternating multilinear form whose value on the canonical basis is $1$. Many (most?) Linear Algebra books use this as a definition of the determinant (before extending the definition to matrices and then linear applications). I think it is equivalent but more satisfying than introducing the determinant by the strange "expansion along a row" formula most PreCalculus textbook use.






              share|cite|improve this answer









              $endgroup$



              In general, the determinant of $n$ vectors $v_1$, $v_2$, $dots$, $v_n$ in $mathbb R^n$ is the determinant of the matrix whose columns are $v_1$, $dots$, $v_n$ (in that order).



              Seen as an application whose inputs are vectors, the determinant has nice properties:



              1. multilinear, that is linear in each variable:
                $$det(v_1,dots, a v_j+b w_j,dots,v_n)
                =
                a det(v_1,dots, v_j,dots,v_n)
                + bdet(v_1,dots, w_j,dots,v_n)$$


              2. alternating: switching two vectors transforms the determinant in its opposite


              $$det(v_1,dots, v_i, dots, v_j,dots,v_n) = det(v_1,dots, v_j, dots, v_i,dots,v_n)$$



              1. The value on the canonical basis $(e_1,dots,e_n)$ of $mathbb R^n$ is $1$.

              $$det(e_1,dots,e_n) = 1 $$



              Actually, it can be proved that the determinant is the unique alternating multilinear form whose value on the canonical basis is $1$. Many (most?) Linear Algebra books use this as a definition of the determinant (before extending the definition to matrices and then linear applications). I think it is equivalent but more satisfying than introducing the determinant by the strange "expansion along a row" formula most PreCalculus textbook use.







              share|cite|improve this answer












              share|cite|improve this answer



              share|cite|improve this answer










              answered 6 hours ago









              TaladrisTaladris

              4,92431933




              4,92431933







              • 2




                $begingroup$
                I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
                $endgroup$
                – lightxbulb
                5 hours ago













              • 2




                $begingroup$
                I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
                $endgroup$
                – lightxbulb
                5 hours ago








              2




              2




              $begingroup$
              I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
              $endgroup$
              – lightxbulb
              5 hours ago





              $begingroup$
              I believe the issue here was not that he didn't know the definition of determinant, but rather the fact that he had a determinant of two vectors rather than a matrix.
              $endgroup$
              – lightxbulb
              5 hours ago












              1












              $begingroup$

              Vectors in a plane $v,w$ can be written as column matrices: $$v=beginbmatrixv_1\v_2endbmatrix, w=beginbmatrixw_1\w_2endbmatrix.$$ Put several of such column matrices side by side, and you get a square matrix: $$(v,w)=beginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$ The determinant $det(v,w)$ is simply the determinant of this square matrix: $$det(v,w)=detbeginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$






              share|cite|improve this answer









              $endgroup$

















                1












                $begingroup$

                Vectors in a plane $v,w$ can be written as column matrices: $$v=beginbmatrixv_1\v_2endbmatrix, w=beginbmatrixw_1\w_2endbmatrix.$$ Put several of such column matrices side by side, and you get a square matrix: $$(v,w)=beginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$ The determinant $det(v,w)$ is simply the determinant of this square matrix: $$det(v,w)=detbeginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$






                share|cite|improve this answer









                $endgroup$















                  1












                  1








                  1





                  $begingroup$

                  Vectors in a plane $v,w$ can be written as column matrices: $$v=beginbmatrixv_1\v_2endbmatrix, w=beginbmatrixw_1\w_2endbmatrix.$$ Put several of such column matrices side by side, and you get a square matrix: $$(v,w)=beginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$ The determinant $det(v,w)$ is simply the determinant of this square matrix: $$det(v,w)=detbeginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$






                  share|cite|improve this answer









                  $endgroup$



                  Vectors in a plane $v,w$ can be written as column matrices: $$v=beginbmatrixv_1\v_2endbmatrix, w=beginbmatrixw_1\w_2endbmatrix.$$ Put several of such column matrices side by side, and you get a square matrix: $$(v,w)=beginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$ The determinant $det(v,w)$ is simply the determinant of this square matrix: $$det(v,w)=detbeginbmatrixv_1&w_1\v_2&w_2endbmatrix.$$







                  share|cite|improve this answer












                  share|cite|improve this answer



                  share|cite|improve this answer










                  answered 1 hour ago









                  edmedm

                  3,6331425




                  3,6331425



























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