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Mirrors > Home > ILE Home > Th. List > moimi | GIF version |
Description: "At most one" is preserved through implication (notice wff reversal). (Contributed by NM, 15-Feb-2006.) |
Ref | Expression |
---|---|
moimi.1 | ⊢ (𝜑 → 𝜓) |
Ref | Expression |
---|---|
moimi | ⊢ (∃*𝑥𝜓 → ∃*𝑥𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | moim 2063 | . 2 ⊢ (∀𝑥(𝜑 → 𝜓) → (∃*𝑥𝜓 → ∃*𝑥𝜑)) | |
2 | moimi.1 | . 2 ⊢ (𝜑 → 𝜓) | |
3 | 1, 2 | mpg 1427 | 1 ⊢ (∃*𝑥𝜓 → ∃*𝑥𝜑) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∃*wmo 2000 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 |
This theorem depends on definitions: df-bi 116 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 |
This theorem is referenced by: moan 2068 moor 2070 mooran1 2071 mooran2 2072 2moex 2085 2euex 2086 2exeu 2091 mosubt 2861 sndisj 3925 disjxsn 3927 mosubopt 4604 funcnvsn 5168 nfunsn 5455 th3qlem2 6532 shftfn 10596 |
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