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Theorem deceq1 12624
Description: Equality theorem for the decimal constructor. (Contributed by Mario Carneiro, 17-Apr-2015.) (Revised by AV, 6-Sep-2021.)
Assertion
Ref Expression
deceq1 (๐ด = ๐ต โ†’ ๐ด๐ถ = ๐ต๐ถ)

Proof of Theorem deceq1
StepHypRef Expression
1 oveq2 7366 . . 3 (๐ด = ๐ต โ†’ ((9 + 1) ยท ๐ด) = ((9 + 1) ยท ๐ต))
21oveq1d 7373 . 2 (๐ด = ๐ต โ†’ (((9 + 1) ยท ๐ด) + ๐ถ) = (((9 + 1) ยท ๐ต) + ๐ถ))
3 df-dec 12620 . 2 ๐ด๐ถ = (((9 + 1) ยท ๐ด) + ๐ถ)
4 df-dec 12620 . 2 ๐ต๐ถ = (((9 + 1) ยท ๐ต) + ๐ถ)
52, 3, 43eqtr4g 2802 1 (๐ด = ๐ต โ†’ ๐ด๐ถ = ๐ต๐ถ)
Colors of variables: wff setvar class
Syntax hints:   โ†’ wi 4   = wceq 1542  (class class class)co 7358  1c1 11053   + caddc 11055   ยท cmul 11057  9c9 12216  cdc 12619
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 2708
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 2715  df-cleq 2729  df-clel 2815  df-rab 3409  df-v 3448  df-dif 3914  df-un 3916  df-in 3918  df-ss 3928  df-nul 4284  df-if 4488  df-sn 4588  df-pr 4590  df-op 4594  df-uni 4867  df-br 5107  df-iota 6449  df-fv 6505  df-ov 7361  df-dec 12620
This theorem is referenced by:  deceq1i  12626
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