RingHom.ext_rat

∀ {F : Type u_1} {R : Type u_5} [inst : Semiring R] [inst_1 : FunLike F ℚ R] [RingHomClass F ℚ R] (f g : F), f = g

Any two ring homomorphisms from ℚ to a semiring are equal. If the codomain is a division ring, then this lemma follows from eq_ratCast.

Defined in: Mathlib.Data.Rat.Cast.Defs
Cited by: 2 results in Mathlib
Foundations: Depth 81 from the axioms · uses propext, Classical.choice, Quot.sound
Assumes: Semiring FunLike RingHomClass

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