Recall that a toric variety is a variety $V$ containing an open dense algebraic torus. Here an algebraic torus means a finite product of copies of the multiplicative group of the ground field (which I ...
Equivalence between Algebraic Semi-group Structures and Coalgebra Structures for an Algebraic Variety?
I was looking at this old question Hopf algebra and group structure correspondence for algebraic varieties which says that there exists an equivalence between algebraic group structures on an ...
This question is motivated by an attempt to understand what is going on in Tom's post from a certain point of view. Let $\mathbb N^+$ be the free semigroup on one generator (so the positive natural ...