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Mirrors > Home > MPE Home > Th. List > deceq2 | Structured version Visualization version GIF version |
Description: Equality theorem for the decimal constructor. (Contributed by Mario Carneiro, 17-Apr-2015.) (Revised by AV, 6-Sep-2021.) |
Ref | Expression |
---|---|
deceq2 | โข (๐ด = ๐ต โ ;๐ถ๐ด = ;๐ถ๐ต) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | oveq2 7417 | . 2 โข (๐ด = ๐ต โ (((9 + 1) ยท ๐ถ) + ๐ด) = (((9 + 1) ยท ๐ถ) + ๐ต)) | |
2 | df-dec 12678 | . 2 โข ;๐ถ๐ด = (((9 + 1) ยท ๐ถ) + ๐ด) | |
3 | df-dec 12678 | . 2 โข ;๐ถ๐ต = (((9 + 1) ยท ๐ถ) + ๐ต) | |
4 | 1, 2, 3 | 3eqtr4g 2798 | 1 โข (๐ด = ๐ต โ ;๐ถ๐ด = ;๐ถ๐ต) |
Colors of variables: wff setvar class |
Syntax hints: โ wi 4 = wceq 1542 (class class class)co 7409 1c1 11111 + caddc 11113 ยท cmul 11115 9c9 12274 ;cdc 12677 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-ext 2704 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-sb 2069 df-clab 2711 df-cleq 2725 df-clel 2811 df-rab 3434 df-v 3477 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-nul 4324 df-if 4530 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-br 5150 df-iota 6496 df-fv 6552 df-ov 7412 df-dec 12678 |
This theorem is referenced by: deceq2i 12685 |
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