Commit 2022-04-12 08:46 ed919b61

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feat(algebra/algebraic_card): Cardinality of algebraic numbers (#12869) We prove the following result: the cardinality of algebraic numbers under an R-algebra is at most # polynomial R * ω.

Estimated changes

Created src/algebra/algebraic_card.lean

added theorem algebraic.cardinal_mk_le_max

added theorem algebraic.cardinal_mk_le_mul

added theorem algebraic.cardinal_mk_le_of_infinite

added theorem algebraic.cardinal_mk_lift_le_max

added theorem algebraic.cardinal_mk_lift_le_mul

added theorem algebraic.cardinal_mk_lift_le_of_infinite

added theorem algebraic.cardinal_mk_of_encodable_of_char_zero

added theorem algebraic.countable_of_encodable

added theorem algebraic.omega_le_cardinal_mk_of_char_zero