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Mirrors > Home > MPE Home > Th. List > nfal | Structured version Visualization version GIF version |
Description: If 𝑥 is not free in 𝜑, it is not free in ∀𝑦𝜑. (Contributed by Mario Carneiro, 11-Aug-2016.) |
Ref | Expression |
---|---|
nfal.1 | ⊢ Ⅎ𝑥𝜑 |
Ref | Expression |
---|---|
nfal | ⊢ Ⅎ𝑥∀𝑦𝜑 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nfal.1 | . . . 4 ⊢ Ⅎ𝑥𝜑 | |
2 | 1 | nf5ri 2191 | . . 3 ⊢ (𝜑 → ∀𝑥𝜑) |
3 | 2 | hbal 2170 | . 2 ⊢ (∀𝑦𝜑 → ∀𝑥∀𝑦𝜑) |
4 | 3 | nf5i 2146 | 1 ⊢ Ⅎ𝑥∀𝑦𝜑 |
Colors of variables: wff setvar class |
Syntax hints: ∀wal 1531 Ⅎwnf 1780 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-10 2141 ax-11 2157 ax-12 2173 |
This theorem depends on definitions: df-bi 209 df-ex 1777 df-nf 1781 |
This theorem is referenced by: nfex 2339 nfnf 2341 nfsbv 2345 nfsbvOLD 2346 aaan 2349 cbval2v 2359 cbval2vOLD 2360 pm11.53 2363 19.12vv 2364 cbval2 2428 cbval2OLD 2429 nfsb4t 2535 nfsb4tALT 2600 mof 2643 euf 2657 2eu3 2735 2eu3OLD 2736 axextmo 2797 nfnfc1 2980 nfnfc 2990 nfabdw 3000 sbcnestgfw 4369 sbcnestgf 4374 nfdisjw 5042 nfdisj 5043 nfdisj1 5044 axrep1 5190 axrep2 5192 axrep3 5193 axrep4 5194 nffr 5528 zfcndrep 10035 zfcndinf 10039 mreexexd 16918 mptelee 26680 mo5f 30252 19.12b 33046 bj-cbv2v 34120 ax11-pm2 34159 wl-sb8t 34787 wl-mo2tf 34806 wl-eutf 34808 wl-mo2t 34810 wl-mo3t 34811 wl-sb8eut 34812 mpobi123f 35439 pm11.57 40719 pm11.59 40721 dfich2OLD 43615 ichnfim 43623 nfsetrecs 44788 |
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