Description: The at-most-one quantifier reverses implication, deduction form. (Contributed by Thierry Arnoux, 25-Feb-2017)
Ref | Expression | ||
---|---|---|---|
Hypothesis | moimdv.1 | |
|
Assertion | moimdv | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | moimdv.1 | |
|
2 | 1 | alrimiv | |
3 | moim | |
|
4 | 2 3 | syl | |