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| Mirrors > Home > MPE Home > Th. List > abid | Structured version Visualization version GIF version | ||
| Description: Simplification of class abstraction notation when the free and bound variables are identical. (Contributed by NM, 26-May-1993.) |
| Ref | Expression |
|---|---|
| abid | ⊢ (𝑥 ∈ {𝑥 ∣ 𝜑} ↔ 𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-clab 2740 | . 2 ⊢ (𝑥 ∈ {𝑥 ∣ 𝜑} ↔ [𝑥 / 𝑥]𝜑) | |
| 2 | sbid 2291 | . 2 ⊢ ([𝑥 / 𝑥]𝜑 ↔ 𝜑) | |
| 3 | 1, 2 | bitri 278 | 1 ⊢ (𝑥 ∈ {𝑥 ∣ 𝜑} ↔ 𝜑) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 [wsb 2099 ∈ wcel 2145 {cab 2739 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-12 2213 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-sb 2100 df-clab 2740 |
| This theorem is used by: eqabrd 2902 eqabf 2952 abid2fOLD 2954 elabgf 3628 ralab2 3655 rexab2 3657 ss2ab 4009 ab0ALT 4330 sbccsb 4394 sbccsb2 4395 eluniab 4881 iunab 5010 iinab 5026 zfrep4 5246 rnep 5909 sniota 6522 opabiota 6959 eusvobj2 7404 eloprabga 7521 finds2 7899 frrlem10 8297 en3lplem2 9598 scottabf 9920 scottexsOLD 9924 scott0bsOLD 9926 cp 9935 setrec2lem2 9957 cardprclem 10041 cfflb 10318 fin23lem29 10400 axdc3lem2 10510 4sqlem12 17114 xkococn 23959 ptcmplem4 24354 noinfbnd1lem1 28062 ofpreima 33241 algextdeglem6 34336 qqhval2 34596 esum2dlem 34706 sigaclcu2 34734 bnj1143 35403 bnj1366 35442 bnj906 35543 bnj1256 35628 bnj1259 35629 bnj1311 35637 mclsax 36303 ellines 36887 bj-csbsnlem 37785 bj-reabeq 37910 bj-velpwALT 37936 topdifinffinlem 38238 rdgssun 38269 finxpreclem6 38287 finxpnom 38292 ralssiun 38298 setindtrs 43985 rababg 44533 compab 45384 tpid3gVD 45783 en3lplem2VD 45785 permaxrep 45948 iunmapsn 46173 ssfiunibd 46268 absnsb 48041 |
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