Metamath Proof Explorer
Description: "At most one" restricted existential quantifier for a statement which is
never true. (Contributed by Thierry Arnoux, 27-Nov-2023)
|
|
Ref |
Expression |
|
Hypothesis |
nrmo.1 |
|
|
Assertion |
nrmo |
|
Proof
Step |
Hyp |
Ref |
Expression |
1 |
|
nrmo.1 |
|
2 |
|
mofal |
|
3 |
1
|
imori |
|
4 |
|
ianor |
|
5 |
3 4
|
mpbir |
|
6 |
5
|
bifal |
|
7 |
6
|
mobii |
|
8 |
2 7
|
mpbir |
|
9 |
|
df-rmo |
|
10 |
8 9
|
mpbir |
|