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Theorem composevalg 5817
 Description: The value of the composition function. (Contributed by Scott Fenton, 19-Apr-2021.)
Assertion
Ref Expression
composevalg ((A V B W) → (A Compose B) = (A B))

Proof of Theorem composevalg
Dummy variables x y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 elex 2867 . . 3 (A VA V)
21adantr 451 . 2 ((A V B W) → A V)
3 elex 2867 . . 3 (B WB V)
43adantl 452 . 2 ((A V B W) → B V)
5 coexg 4749 . 2 ((A V B W) → (A B) V)
6 coeq1 4874 . . 3 (x = A → (x y) = (A y))
7 coeq2 4875 . . 3 (y = B → (A y) = (A B))
8 df-compose 5748 . . 3 Compose = (x V, y V (x y))
96, 7, 8ovmpt2g 5715 . 2 ((A V B V (A B) V) → (A Compose B) = (A B))
102, 4, 5, 9syl3anc 1182 1 ((A V B W) → (A Compose B) = (A B))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 358   = wceq 1642   ∈ wcel 1710  Vcvv 2859   ∘ ccom 4721  (class class class)co 5525   Compose ccompose 5747 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-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  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-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-lefin 4440  df-ltfin 4441  df-ncfin 4442  df-tfin 4443  df-evenfin 4444  df-oddfin 4445  df-sfin 4446  df-spfin 4447  df-phi 4565  df-op 4566  df-proj1 4567  df-proj2 4568  df-opab 4623  df-br 4640  df-co 4726  df-ima 4727  df-id 4767  df-cnv 4785  df-rn 4786  df-dm 4787  df-fun 4789  df-fv 4795  df-ov 5526  df-oprab 5528  df-mpt2 5654  df-compose 5748 This theorem is referenced by:  brcomposeg  5819
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