![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > sbcid | Structured version Visualization version GIF version |
Description: An identity theorem for substitution. See sbid 2243. (Contributed by Mario Carneiro, 18-Feb-2017.) |
Ref | Expression |
---|---|
sbcid | ⊢ ([𝑥 / 𝑥]𝜑 ↔ 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sbsbc 3780 | . 2 ⊢ ([𝑥 / 𝑥]𝜑 ↔ [𝑥 / 𝑥]𝜑) | |
2 | sbid 2243 | . 2 ⊢ ([𝑥 / 𝑥]𝜑 ↔ 𝜑) | |
3 | 1, 2 | bitr3i 277 | 1 ⊢ ([𝑥 / 𝑥]𝜑 ↔ 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 [wsb 2060 [wsbc 3776 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-12 2167 ax-ext 2699 |
This theorem depends on definitions: df-bi 206 df-an 396 df-ex 1775 df-sb 2061 df-clab 2706 df-cleq 2720 df-clel 2806 df-sbc 3777 |
This theorem is referenced by: csbid 3905 snfil 23767 ex-natded9.26 30228 bnj605 34538 dedths 38434 frege93 43386 or2expropbilem1 46414 |
Copyright terms: Public domain | W3C validator |