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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 2179 | . 2 ⊢ (∃𝑥𝜑 → ∀𝑥∃𝑥𝜑) | |
| 2 | 1 | nf5i 2182 | 1 ⊢ Ⅎ𝑥∃𝑥𝜑 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∃wex 1811 Ⅎwnf 1815 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-10 2177 |
| This proof depends on definitions: df-bi 210 df-ex 1812 df-nf 1816 |
| This theorem is used by: nfa1 2187 nfnf1 2190 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 3606 morex 3676 intab 4937 nfopab1 5174 nfopab2 5175 axrep1 5232 axrep2 5234 axrep3 5235 eusv2nf 5357 copsexgwOLD 5461 copsexg 5462 copsex2t 5464 mosubopt 5482 mosubott 5484 dfid3 5549 dmcossOLD 5959 imadif 6629 oprabidw 7455 nfoprab1 7485 nfoprab2 7486 nfoprab3 7487 zfcndrep 10706 zfcndpow 10708 zfcndreg 10709 zfcndinf 10710 reclem2pr 11140 ex-natded9.26 31029 brabgaf 33251 bnj607 35596 bnj849 35605 bnj1398 35714 bnj1449 35728 finminlem 37202 exisym1 37308 bj-alexbiex 37697 bj-exexbiex 37698 bj-biexal2 37704 bj-biexex 37707 bj-sbf3 37847 bj-axseprep 38098 bj-axreprepsep 38099 copsex2d 38169 sbexi 39154 ac6s6 39213 nfe2 43376 e2ebind 45654 e2ebindVD 46002 e2ebindALT 46019 stoweidlem57 47175 ovncvrrp 47682 ich2ex 48658 ichreuopeq 48663 reuopreuprim 48716 pgind 50993 |
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