Description: From non-equality to inequality. (Contributed by Glauco Siliprandi, 11-Dec-2019)
Ref | Expression | ||
---|---|---|---|
Assertion | neqne | $${\u22a2}\neg {A}={B}\to {A}\ne {B}$$ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id | $${\u22a2}\neg {A}={B}\to \neg {A}={B}$$ | |
2 | 1 | neqned | $${\u22a2}\neg {A}={B}\to {A}\ne {B}$$ |