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| Mirrors > Home > MPE Home > Th. List > nfe1 | Structured version Visualization version GIF version | ||
| Description: The setvar 𝑥 is not free in ∃𝑥𝜑. (Contributed by Mario Carneiro, 11-Aug-2016.) |
| Ref | Expression |
|---|---|
| nfe1 | ⊢ Ⅎ𝑥∃𝑥𝜑 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | hbe1 2181 | . 2 ⊢ (∃𝑥𝜑 → ∀𝑥∃𝑥𝜑) | |
| 2 | 1 | nf5i 2184 | 1 ⊢ Ⅎ𝑥∃𝑥𝜑 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∃wex 1812 Ⅎwnf 1816 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-10 2179 |
| This proof depends on definitions: df-bi 210 df-ex 1813 df-nf 1817 |
| This theorem is used by: nfa1 2189 nfnf1 2192 sbalex 2281 nf6 2320 exdistrf 2481 nfeu1 2619 euor2 2643 2moexv 2657 moexexvw 2658 2moswapv 2659 2euexv 2661 eupicka 2664 mopick2 2667 moexex 2668 2moex 2670 2euex 2671 2moswap 2674 2mo 2678 2eu7 2687 2eu8 2688 nfre1 3292 ceqsexg 3614 morex 3684 intab 4945 nfopab1 5183 nfopab2 5184 axrep1 5241 axrep2 5243 axrep3 5244 axrep4OLD 5247 eusv2nf 5368 copsexgwOLD 5475 copsexg 5476 copsex2t 5477 mosubopt 5495 dfid3 5561 dmcossOLD 5968 imadif 6624 oprabidw 7450 nfoprab1 7480 nfoprab2 7481 nfoprab3 7482 zfcndrep 10614 zfcndpow 10616 zfcndreg 10617 zfcndinf 10618 reclem2pr 11048 ex-natded9.26 30841 brabgaf 33022 bnj607 35369 bnj849 35378 bnj1398 35487 bnj1449 35501 finminlem 36886 exisym1 36992 bj-alexbiex 37381 bj-exexbiex 37382 bj-biexal2 37388 bj-biexex 37391 bj-sbf3 37531 bj-axseprep 37768 bj-axreprepsep 37769 copsex2d 37840 sbexi 38820 ac6s6 38879 nfe2 43042 e2ebind 45330 e2ebindVD 45678 e2ebindALT 45695 stoweidlem57 46829 ovncvrrp 47336 ich2ex 48275 ichreuopeq 48280 reuopreuprim 48333 pgind 50552 |
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