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Questions in which polynomials (single or several variables) play a key role. It is typically important that this tag is combined with other tags; polynomials appear in very different contexts. Please, use at least one of the top-level tags, such as nt.number-theory, co.combinatorics, ac.commutative-algebra, in addition to it. Also, note the more specific tags for some special types of polynomials, e.g., orthogonal-polynomials, symmetric-polynomials.

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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 …