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Theorem fovcdm 6197
Description: An operation's value belongs to its codomain. (Contributed by NM, 27-Aug-2006.)
Assertion
Ref Expression
fovcdm ((𝐹:(𝑅 × 𝑆)⟶𝐶𝐴𝑅𝐵𝑆) → (𝐴𝐹𝐵) ∈ 𝐶)

Proof of Theorem fovcdm
StepHypRef Expression
1 opelxpi 4781 . . 3 ((𝐴𝑅𝐵𝑆) → ⟨𝐴, 𝐵⟩ ∈ (𝑅 × 𝑆))
2 df-ov 6053 . . . 4 (𝐴𝐹𝐵) = (𝐹‘⟨𝐴, 𝐵⟩)
3 ffvelcdm 5810 . . . 4 ((𝐹:(𝑅 × 𝑆)⟶𝐶 ∧ ⟨𝐴, 𝐵⟩ ∈ (𝑅 × 𝑆)) → (𝐹‘⟨𝐴, 𝐵⟩) ∈ 𝐶)
42, 3eqeltrid 2319 . . 3 ((𝐹:(𝑅 × 𝑆)⟶𝐶 ∧ ⟨𝐴, 𝐵⟩ ∈ (𝑅 × 𝑆)) → (𝐴𝐹𝐵) ∈ 𝐶)
51, 4sylan2 286 . 2 ((𝐹:(𝑅 × 𝑆)⟶𝐶 ∧ (𝐴𝑅𝐵𝑆)) → (𝐴𝐹𝐵) ∈ 𝐶)
653impb 1226 1 ((𝐹:(𝑅 × 𝑆)⟶𝐶𝐴𝑅𝐵𝑆) → (𝐴𝐹𝐵) ∈ 𝐶)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104  w3a 1005  wcel 2203  cop 3692   × cxp 4747  wf 5348  cfv 5352  (class class class)co 6050
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-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 4228  ax-pow 4287  ax-pr 4322
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  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-ral 2525  df-rex 2526  df-v 2815  df-sbc 3043  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-fv 5360  df-ov 6053
This theorem is referenced by:  fovcdmda  6198  fovcdmd  6199  ovmpoelrn  6403  mapxpen  7101  imasmnd2  13665  grpsubcl  13793  imasgrp2  13827  imasring  14208  psmetcl  15191  xmetcl  15217  metcl  15218  blssm  15286
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