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Mirrors > Home > MPE Home > Th. List > eumoi | Structured version Visualization version GIF version |
Description: "At most one" inferred from existential uniqueness. (Contributed by NM, 5-Apr-1995.) |
Ref | Expression |
---|---|
eumoi.1 | ⊢ ∃!𝑥𝜑 |
Ref | Expression |
---|---|
eumoi | ⊢ ∃*𝑥𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | eumoi.1 | . 2 ⊢ ∃!𝑥𝜑 | |
2 | eumo 2499 | . 2 ⊢ (∃!𝑥𝜑 → ∃*𝑥𝜑) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ ∃*𝑥𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ∃!weu 2470 ∃*wmo 2471 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 |
This theorem depends on definitions: df-bi 197 df-an 386 df-ex 1705 df-eu 2474 df-mo 2475 |
This theorem is referenced by: euxfr 3392 |
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