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Theorem addcid2 4407
Description: Cardinal zero is a fixed point for cardinal addition. Theorem X.1.8 of [Rosser] p. 276. (Contributed by SF, 16-Jan-2015.)
Assertion
Ref Expression
addcid2 (0c +c A) = A

Proof of Theorem addcid2
StepHypRef Expression
1 addccom 4406 . 2 (0c +c A) = (A +c 0c)
2 addcid1 4405 . 2 (A +c 0c) = A
31, 2eqtri 2373 1 (0c +c A) = A
Colors of variables: wff setvar class
Syntax hints:   = wceq 1642  0cc0c 4374   +c cplc 4375
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-sn 4087
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-nul 3551  df-pw 3724  df-sn 3741  df-pr 3742  df-opk 4058  df-1c 4136  df-pw1 4137  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-sik 4192  df-ssetk 4193  df-0c 4377  df-addc 4378
This theorem is referenced by:  nnsucelr  4428  preaddccan2  4455  0cminle  4461  tfin1c  4499  0ceven  4505  evenodddisj  4516  addceq0  6219  1ne0c  6240  addccan2nc  6264  nncdiv3  6275  nnc3n3p1  6276  nchoicelem14  6300  nchoicelem17  6303
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