Skip to main content
MathOverflow

Return to Question

Capitalise title, while this is on the front page
Source Link
LSpice
LSpice
  • 12.9k
  • 4
  • 45
  • 69

explicit Explicit formula for the j-invariant of binary quartic form

A binary quartic form

$aX^4+bX^3Y+cX^2Y^2+dXY^3+Y^4$$$aX^4+bX^3Y+cX^2Y^2+dXY^3+Y^4$$

decomposes as a product of linear factors $Y-t_jX$, $j=1,...,4$$j=1,\dotsc,4$. I would like to have an explicit formula for symmetrization of the crossratio of $t_j$.

explicit formula for the j-invariant of binary quartic form

A binary quartic form

$aX^4+bX^3Y+cX^2Y^2+dXY^3+Y^4$

decomposes as a product of linear factors $Y-t_jX$, $j=1,...,4$. I would like to have an explicit formula for symmetrization of the crossratio of $t_j$.

Explicit formula for the j-invariant of binary quartic form

A binary quartic form

$$aX^4+bX^3Y+cX^2Y^2+dXY^3+Y^4$$

decomposes as a product of linear factors $Y-t_jX$, $j=1,\dotsc,4$. I would like to have an explicit formula for symmetrization of the crossratio of $t_j$.

Source Link
David Marín
David Marín
  • 105
  • 5

explicit formula for the j-invariant of binary quartic form

A binary quartic form

$aX^4+bX^3Y+cX^2Y^2+dXY^3+Y^4$

decomposes as a product of linear factors $Y-t_jX$, $j=1,...,4$. I would like to have an explicit formula for symmetrization of the crossratio of $t_j$.