HomeHome Metamath Proof Explorer < Previous   Next >
Related theorems
Unicode version

Theorem ndmoprg 4034
Description: The value of an operation outside its domain.
Assertion
Ref Expression
ndmoprg |- ((dom F = (R X. S) /\ B e. C /\ -. (A e. R /\ B e. S)) -> (AFB) = (/))

Proof of Theorem ndmoprg
StepHypRef Expression
1 eleq2 1532 . . . . 5 |- (dom F = (R X. S) -> (<.A, B>. e. dom F <-> <.A, B>. e. (R X. S)))
2 opelxpg 3211 . . . . 5 |- (B e. C -> (<.A, B>. e. (R X. S) <-> (A e. R /\ B e. S)))
31, 2sylan9bb 539 . . . 4 |- ((dom F = (R X. S) /\ B e. C) -> (<.A, B>. e. dom F <-> (A e. R /\ B e. S)))
43negbid 610 . . 3 |- ((dom F = (R X. S) /\ B e. C) -> (-. <.A, B>. e. dom F <-> -. (A e. R /\ B e. S)))
5 ndmfv 3736 . . . 4 |- (-. <.A, B>. e. dom F -> (F` <.A, B>.) = (/))
6 df-opr 3956 . . . 4 |- (AFB) = (F` <.A, B>.)
75, 6syl5eq 1516 . . 3 |- (-. <.A, B>. e. dom F -> (AFB) = (/))
84, 7syl6bir 215 . 2 |- ((dom F = (R X. S) /\ B e. C) -> (-. (A e. R /\ B e. S) -> (AFB) = (/)))
983impia 829 1 |- ((dom F = (R X. S) /\ B e. C /\ -. (A e. R /\ B e. S)) -> (AFB) = (/))
Colors of variables: wff set class
Syntax hints:  -. wn 2   -> wi 3   /\ wa 223   /\ w3a 774   = wceq 954   e. wcel 956  (/)c0 2276  <.cop 2407   X. cxp 3163  dom cdm 3165  ` cfv 3177  (class class class)co 3954
This theorem is referenced by:  curry1val 4090
This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 960  ax-gen 961  ax-8 962  ax-10 964  ax-11 965  ax-12 966  ax-13 967  ax-14 968  ax-17 969  ax-4 971  ax-5o 973  ax-6o 976  ax-9o 1121  ax-10o 1138  ax-16 1208  ax-11o 1216  ax-ext 1457  ax-sep 2698  ax-pow 2737  ax-pr 2774
This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3an 776  df-ex 979  df-sb 1170  df-eu 1380  df-mo 1381  df-clab 1462  df-cleq 1467  df-clel 1470  df-ne 1584  df-ral 1646  df-rex 1647  df-v 1808  df-dif 2045  df-un 2046  df-in 2047  df-ss 2049  df-nul 2277  df-pw 2398  df-sn 2408  df-pr 2409  df-op 2412  df-uni 2499  df-br 2615  df-opab 2662  df-xp 3179  df-cnv 3181  df-dm 3183  df-rn 3184  df-res 3185  df-ima 3186  df-fv 3193  df-opr 3956
Copyright terms: Public domain