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Mirrors > Home > MPE Home > Th. List > equsb3 | Structured version Visualization version GIF version |
Description: Substitution applied to an atomic wff. (Contributed by Raph Levien and FL, 4-Dec-2005.) Remove dependency on ax-11 2034. (Revised by Wolf Lammen, 21-Sep-2018.) |
Ref | Expression |
---|---|
equsb3 | ⊢ ([𝑥 / 𝑦]𝑦 = 𝑧 ↔ 𝑥 = 𝑧) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equsb3lem 2431 | . . 3 ⊢ ([𝑤 / 𝑦]𝑦 = 𝑧 ↔ 𝑤 = 𝑧) | |
2 | 1 | sbbii 1887 | . 2 ⊢ ([𝑥 / 𝑤][𝑤 / 𝑦]𝑦 = 𝑧 ↔ [𝑥 / 𝑤]𝑤 = 𝑧) |
3 | sbcom3 2411 | . . 3 ⊢ ([𝑥 / 𝑤][𝑤 / 𝑦]𝑦 = 𝑧 ↔ [𝑥 / 𝑤][𝑥 / 𝑦]𝑦 = 𝑧) | |
4 | nfv 1843 | . . . 4 ⊢ Ⅎ𝑤[𝑥 / 𝑦]𝑦 = 𝑧 | |
5 | 4 | sbf 2380 | . . 3 ⊢ ([𝑥 / 𝑤][𝑥 / 𝑦]𝑦 = 𝑧 ↔ [𝑥 / 𝑦]𝑦 = 𝑧) |
6 | 3, 5 | bitri 264 | . 2 ⊢ ([𝑥 / 𝑤][𝑤 / 𝑦]𝑦 = 𝑧 ↔ [𝑥 / 𝑦]𝑦 = 𝑧) |
7 | equsb3lem 2431 | . 2 ⊢ ([𝑥 / 𝑤]𝑤 = 𝑧 ↔ 𝑥 = 𝑧) | |
8 | 2, 6, 7 | 3bitr3i 290 | 1 ⊢ ([𝑥 / 𝑦]𝑦 = 𝑧 ↔ 𝑥 = 𝑧) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 196 [wsb 1880 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-10 2019 ax-12 2047 ax-13 2246 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-ex 1705 df-nf 1710 df-sb 1881 |
This theorem is referenced by: sb8eu 2503 mo3 2507 sb8iota 5858 mo5f 29324 mptsnunlem 33185 wl-equsb3 33337 wl-mo3t 33358 wl-sb8eut 33359 frege55lem1b 38189 sbeqal1 38598 |
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