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Theorem decma 8405
Description: Perform a multiply-add of two numerals 𝑀 and 𝑁 against a fixed multiplicand 𝑃 (no carry). (Contributed by Mario Carneiro, 18-Feb-2014.)
Hypotheses
Ref Expression
decma.1 𝐴 ∈ ℕ0
decma.2 𝐵 ∈ ℕ0
decma.3 𝐶 ∈ ℕ0
decma.4 𝐷 ∈ ℕ0
decma.5 𝑀 = 𝐴𝐵
decma.6 𝑁 = 𝐶𝐷
decma.7 𝑃 ∈ ℕ0
decma.8 ((𝐴 · 𝑃) + 𝐶) = 𝐸
decma.9 ((𝐵 · 𝑃) + 𝐷) = 𝐹
Assertion
Ref Expression
decma ((𝑀 · 𝑃) + 𝑁) = 𝐸𝐹

Proof of Theorem decma
StepHypRef Expression
1 10nn0 8206 . . 3 10 ∈ ℕ0
2 decma.1 . . 3 𝐴 ∈ ℕ0
3 decma.2 . . 3 𝐵 ∈ ℕ0
4 decma.3 . . 3 𝐶 ∈ ℕ0
5 decma.4 . . 3 𝐷 ∈ ℕ0
6 decma.5 . . . 4 𝑀 = 𝐴𝐵
7 df-dec 8369 . . . 4 𝐴𝐵 = ((10 · 𝐴) + 𝐵)
86, 7eqtri 2060 . . 3 𝑀 = ((10 · 𝐴) + 𝐵)
9 decma.6 . . . 4 𝑁 = 𝐶𝐷
10 df-dec 8369 . . . 4 𝐶𝐷 = ((10 · 𝐶) + 𝐷)
119, 10eqtri 2060 . . 3 𝑁 = ((10 · 𝐶) + 𝐷)
12 decma.7 . . 3 𝑃 ∈ ℕ0
13 decma.8 . . 3 ((𝐴 · 𝑃) + 𝐶) = 𝐸
14 decma.9 . . 3 ((𝐵 · 𝑃) + 𝐷) = 𝐹
151, 2, 3, 4, 5, 8, 11, 12, 13, 14numma 8398 . 2 ((𝑀 · 𝑃) + 𝑁) = ((10 · 𝐸) + 𝐹)
16 df-dec 8369 . 2 𝐸𝐹 = ((10 · 𝐸) + 𝐹)
1715, 16eqtr4i 2063 1 ((𝑀 · 𝑃) + 𝑁) = 𝐸𝐹
Colors of variables: wff set class
Syntax hints:   = wceq 1243  wcel 1393  (class class class)co 5512   + caddc 6892   · cmul 6894  10c10 7972  0cn0 8181  cdc 8368
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-io 630  ax-5 1336  ax-7 1337  ax-gen 1338  ax-ie1 1382  ax-ie2 1383  ax-8 1395  ax-10 1396  ax-11 1397  ax-i12 1398  ax-bndl 1399  ax-4 1400  ax-17 1419  ax-i9 1423  ax-ial 1427  ax-i5r 1428  ax-ext 2022  ax-sep 3875  ax-cnex 6975  ax-resscn 6976  ax-1re 6978  ax-addcl 6980  ax-addrcl 6981  ax-mulcl 6982  ax-addcom 6984  ax-mulcom 6985  ax-addass 6986  ax-mulass 6987  ax-distr 6988  ax-rnegex 6993
This theorem depends on definitions:  df-bi 110  df-3an 887  df-tru 1246  df-nf 1350  df-sb 1646  df-clab 2027  df-cleq 2033  df-clel 2036  df-nfc 2167  df-ral 2311  df-rex 2312  df-v 2559  df-un 2922  df-in 2924  df-ss 2931  df-sn 3381  df-pr 3382  df-op 3384  df-uni 3581  df-int 3616  df-br 3765  df-iota 4867  df-fv 4910  df-ov 5515  df-inn 7915  df-2 7973  df-3 7974  df-4 7975  df-5 7976  df-6 7977  df-7 7978  df-8 7979  df-9 7980  df-10 7981  df-n0 8182  df-dec 8369
This theorem is referenced by: (None)
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