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| Mirrors > Home > ILE Home > Th. List > sbceq1a | GIF version | ||
| Description: Equality theorem for class substitution. Class version of sbequ12 1824. (Contributed by NM, 26-Sep-2003.) |
| Ref | Expression |
|---|---|
| sbceq1a | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | sbid 1827 | . 2 ⊢ ([𝑥 / 𝑥]𝜑 ↔ 𝜑) | |
| 2 | dfsbcq2 3054 | . 2 ⊢ (𝑥 = 𝐴 → ([𝑥 / 𝑥]𝜑 ↔ [𝐴 / 𝑥]𝜑)) | |
| 3 | 1, 2 | bitr3id 194 | 1 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ [𝐴 / 𝑥]𝜑)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 [wsb 1815 [wsbc 3051 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-5 1500 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-sbc 3052 |
| This theorem is used by: sbceq2a 3062 elrabsf 3090 cbvralcsf 3210 cbvrexcsf 3211 ifeqeqxdc 3687 rabsnifsb 3777 euotd 4397 omsinds 4771 elfvmptrab1 5804 ralrnmpt 5853 rexrnmpt 5854 riotass2 6070 riotass 6071 elovmporab 6292 elovmporab1w 6293 uchoice 6375 sbcopeq1a 6425 mpoxopoveq 6516 findcard2 7199 findcard2s 7200 ac6sfi 7208 opabfi 7253 dcfi 7320 indpi 7715 nn0ind-raph 9773 indstr 10008 fzrevral 10528 exfzdc 10675 zsupcllemstep 10678 infssuzex 10682 uzsinds 10901 wrdind 11515 wrd2ind 11516 prmind2 12922 gropd 16510 grstructd2dom 16511 bj-intabssel 17039 bj-bdfindes 17197 bj-findes 17229 |
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