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Commit 2023-01-09 10:12 ba2d8fb3

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feat(ring_theory/ideal/operations): add span_singleton_mul_left lemmas (#18056)

Estimated changes

Modified src/algebra/module/pid.lean

Modified src/ring_theory/ideal/basic.lean

modified theorem ideal.mem_span_singleton

added theorem ideal.mem_span_singleton_self

Modified src/ring_theory/ideal/operations.lean

added theorem ideal.span_singleton_mul_left_inj

added theorem ideal.span_singleton_mul_left_injective

added theorem ideal.span_singleton_mul_left_mono

added theorem ideal.span_singleton_mul_right_inj

added theorem ideal.span_singleton_mul_right_injective

added theorem ideal.span_singleton_mul_right_mono