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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

4 votes

$\lambda$-ring structure defined for a graded ring in Fulton–Lang's book

Hazewinkel in Witt vectors. Part 1 warns about an error on page 15, second paragraph of this book. In fact he advises to "steer clear" of the book!
Martin Sleziak's user avatar