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Related theorems GIF version |
| Description: Existential uniqueness implies "at most one." |
| Ref | Expression |
|---|---|
| eumo | ⊢ (∃!xφ → ∃*xφ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eu5 1411 | . 2 ⊢ (∃!xφ ↔ (∃xφ ⋀ ∃*xφ)) | |
| 2 | 1 | pm3.27bi 326 | 1 ⊢ (∃!xφ → ∃*xφ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 3 ∃wex 982 ∃!weu 1382 ∃*wmo 1383 |
| This theorem is referenced by: eumoi 1414 euimmo 1422 moaneu 1432 eupick 1436 euor2 1440 2eumo 1445 2eu2 1453 2eu5 1456 moeq3 1924 euabex 2773 reuxfr 2910 dffun7 3546 zfrep6 3620 fnopabg 3621 dff2 3823 fnoprabg 4018 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-10 968 ax-11 969 ax-12 970 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 |