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Theorem pnpncand 8647
Description: Addition/subtraction cancellation law. (Contributed by Scott Fenton, 14-Dec-2017.)
Hypotheses
Ref Expression
pnpncand.1 (𝜑𝐴 ∈ ℂ)
pnpncand.2 (𝜑𝐵 ∈ ℂ)
pnpncand.3 (𝜑𝐶 ∈ ℂ)
Assertion
Ref Expression
pnpncand (𝜑 → ((𝐴 + (𝐵𝐶)) + (𝐶𝐵)) = 𝐴)

Proof of Theorem pnpncand
StepHypRef Expression
1 pnpncand.1 . . . 4 (𝜑𝐴 ∈ ℂ)
2 pnpncand.2 . . . . 5 (𝜑𝐵 ∈ ℂ)
3 pnpncand.3 . . . . 5 (𝜑𝐶 ∈ ℂ)
42, 3subcld 8583 . . . 4 (𝜑 → (𝐵𝐶) ∈ ℂ)
51, 4addcld 8292 . . 3 (𝜑 → (𝐴 + (𝐵𝐶)) ∈ ℂ)
65, 2, 3subsub2d 8612 . 2 (𝜑 → ((𝐴 + (𝐵𝐶)) − (𝐵𝐶)) = ((𝐴 + (𝐵𝐶)) + (𝐶𝐵)))
71, 4pncand 8584 . 2 (𝜑 → ((𝐴 + (𝐵𝐶)) − (𝐵𝐶)) = 𝐴)
86, 7eqtr3d 2267 1 (𝜑 → ((𝐴 + (𝐵𝐶)) + (𝐶𝐵)) = 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1398  wcel 2203  (class class class)co 6049  cc 8124   + caddc 8129  cmin 8443
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4227  ax-pow 4286  ax-pr 4321  ax-setind 4658  ax-resscn 8218  ax-1cn 8219  ax-icn 8221  ax-addcl 8222  ax-addrcl 8223  ax-mulcl 8224  ax-addcom 8226  ax-addass 8228  ax-distr 8230  ax-i2m1 8231  ax-0id 8234  ax-rnegex 8235  ax-cnre 8237
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2814  df-sbc 3042  df-dif 3212  df-un 3214  df-in 3216  df-ss 3223  df-pw 3670  df-sn 3694  df-pr 3695  df-op 3697  df-uni 3914  df-br 4109  df-opab 4171  df-id 4413  df-xp 4754  df-rel 4755  df-cnv 4756  df-co 4757  df-dm 4758  df-iota 5311  df-fun 5353  df-fv 5359  df-riota 6002  df-ov 6052  df-oprab 6053  df-mpo 6054  df-sub 8445
This theorem is referenced by: (None)
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