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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 2279 nf6 2317 exdistrf 2477 nfeu1 2615 euor2 2639 2moexv 2653 moexexvw 2654 2moswapv 2655 2euexv 2657 eupicka 2660 mopick2 2663 moexex 2664 2moex 2666 2euex 2667 2moswap 2670 2mo 2674 2eu7 2683 2eu8 2684 nfre1 3288 ceqsexg 3607 morex 3677 intab 4938 nfopab1 5175 nfopab2 5176 axrep1 5233 axrep2 5235 axrep3 5236 eusv2nf 5357 copsexgwOLD 5461 copsexg 5462 copsex2t 5464 mosubopt 5482 mosubott 5484 dfid3 5549 dmcossOLD 5958 imadif 6622 oprabidw 7449 nfoprab1 7479 nfoprab2 7480 nfoprab3 7481 zfcndrep 10692 zfcndpow 10694 zfcndreg 10695 zfcndinf 10696 reclem2pr 11126 ex-natded9.26 31013 brabgaf 33193 bnj607 35539 bnj849 35548 bnj1398 35657 bnj1449 35671 finminlem 37086 exisym1 37192 bj-alexbiex 37581 bj-exexbiex 37582 bj-biexal2 37588 bj-biexex 37591 bj-sbf3 37731 bj-axseprep 37970 bj-axreprepsep 37971 copsex2d 38040 sbexi 39025 ac6s6 39084 nfe2 43247 e2ebind 45531 e2ebindVD 45879 e2ebindALT 45896 stoweidlem57 47036 ovncvrrp 47543 ich2ex 48519 ichreuopeq 48524 reuopreuprim 48577 pgind 50779 |
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