Theorem mpoxopx0ov0 7875

Description: If the first argument of an operation given by a maps-to rule, where the first argument is a pair and the base set of the second argument is the first component of the first argument, is the empty set, then the value of the operation is the empty set. (Contributed by Alexander van der Vekens, 10-Oct-2017.)

Hypothesis

Ref	Expression
mpoxopn0yelv.f	⊢ 𝐹 = (𝑥 ∈ V, 𝑦 ∈ (1st ‘𝑥) ↦ 𝐶)

Assertion

Ref	Expression
mpoxopx0ov0	⊢ (∅𝐹𝐾) = ∅

Distinct variable groups:   𝑥,𝑦   𝑥,𝐾   𝑥,𝐹

Allowed substitution hints:   𝐶(𝑥,𝑦)   𝐹(𝑦)   𝐾(𝑦)

Proof of Theorem mpoxopx0ov0

Step	Hyp	Ref	Expression
1		0nelxp 5582	. 2 ⊢ ¬ ∅ ∈ (V × V)
2		mpoxopn0yelv.f	. . 3 ⊢ 𝐹 = (𝑥 ∈ V, 𝑦 ∈ (1st ‘𝑥) ↦ 𝐶)
3	2	mpoxopxnop0 7874	. 2 ⊢ (¬ ∅ ∈ (V × V) → (∅𝐹𝐾) = ∅)
4	1, 3	ax-mp 5	1 ⊢ (∅𝐹𝐾) = ∅

Syntax hints:  ¬ wn 3   = wceq 1536   ∈ wcel 2113  Vcvv 3491  ∅c0 4284   × cxp 5546  ‘cfv 6348  (class class class)co 7149   ∈ cmpo 7151  1^st c1st 7680

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-ral 3142  df-rex 3143  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-nul 4285  df-if 4461  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-iun 4914  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-iota 6307  df-fun 6350  df-fv 6356  df-ov 7152  df-oprab 7153  df-mpo 7154  df-1st 7682  df-2nd 7683

This theorem is referenced by: (None)