3 problems

Extension-composition conjecture. There is a graded isomorphism, taking total degree on the left-hand side,

Let $k$ be a field of characteristic $p$, let $r$ be a nonnegative integer, and let $G$ belong to the category of homogeneous strict polynomial functors of degree $d$. Let…

Let $F$ and $G$ be strict polynomial functors, and for $r\geq 0$ let $E(F,G,r)$ denote the twisting spectral sequence associated with them, whose abutment computes…