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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 2180 | . 2 ⊢ (∃𝑥𝜑 → ∀𝑥∃𝑥𝜑) | |
| 2 | 1 | nf5i 2183 | 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 2178 |
| This proof depends on definitions: df-bi 210 df-ex 1813 df-nf 1817 |
| This theorem is used by: nfa1 2188 nfnf1 2191 sbalex 2278 nf6 2316 exdistrf 2476 nfeu1 2614 euor2 2638 2moexv 2652 moexexvw 2653 2moswapv 2654 2euexv 2656 eupicka 2659 mopick2 2662 moexex 2663 2moex 2665 2euex 2666 2moswap 2669 2mo 2673 2eu7 2682 2eu8 2683 nfre1 3287 ceqsexg 3607 morex 3677 intab 4938 nfopab1 5175 nfopab2 5176 axrep1 5233 axrep2 5235 axrep3 5236 axrep4OLD 5239 eusv2nf 5360 copsexgwOLD 5467 copsexg 5468 copsex2t 5469 mosubopt 5487 dfid3 5553 dmcossOLD 5960 imadif 6617 oprabidw 7444 nfoprab1 7474 nfoprab2 7475 nfoprab3 7476 zfcndrep 10623 zfcndpow 10625 zfcndreg 10626 zfcndinf 10627 reclem2pr 11057 ex-natded9.26 30899 brabgaf 33079 bnj607 35425 bnj849 35434 bnj1398 35543 bnj1449 35557 finminlem 36937 exisym1 37043 bj-alexbiex 37432 bj-exexbiex 37433 bj-biexal2 37439 bj-biexex 37442 bj-sbf3 37582 bj-axseprep 37819 bj-axreprepsep 37820 copsex2d 37891 sbexi 38861 ac6s6 38920 nfe2 43083 e2ebind 45386 e2ebindVD 45734 e2ebindALT 45751 stoweidlem57 46885 ovncvrrp 47392 ich2ex 48368 ichreuopeq 48373 reuopreuprim 48426 pgind 50643 |
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