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comment $\lambda$-rings and hopf-rings
Hoffman's book is very nice indeed.
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comment Multivariable Calculus Lecture Ideas
@stankewicz @Ben Crowell The course is twenty students. Most students are some kind of science major. They are unresponsive. It is an early morning class as well.
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comment $\lambda$-rings and hopf-rings
@VladimirDotsenko: Having a product and coproduct makes it a hopf algebra. A hopf ring has an additional product that satisfies some further axioms with the coproduct and original product.
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