Haruhisa Enomoto

Results 2 issues of Haruhisa Enomoto

This PR replaces the previous typeclass for maximal left ideals `ideal.is_maximal : ideal R -> Prop` with `submodule.is_maximal : submodule R M -> Prop`, which is a typeclass for maximal...

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Define the Jacobson radical of a ring as the intersection of all maximal left ideals, and prove basic properties: famous equivalent conditions for an element in a ring to be...

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