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Mirrors > Home > NFE Home > Th. List > exmo | Unicode version |
Description: Something exists or at most one exists. (Contributed by NM, 8-Mar-1995.) |
Ref | Expression |
---|---|
exmo |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.21 100 | . . 3 | |
2 | df-mo 2209 | . . 3 | |
3 | 1, 2 | sylibr 203 | . 2 |
4 | 3 | orri 365 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wo 357 wex 1541 weu 2204 wmo 2205 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 df-or 359 df-mo 2209 |
This theorem is referenced by: moexex 2273 mo2icl 3015 mosubopt 4612 |
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