Theorem dmmpt2 7129

Description: Domain of a class given by the "maps to" notation. (Contributed by FL, 17-May-2010.)

Hypotheses

Ref	Expression
fmpt2.1	⊢ 𝐹 = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶)
fnmpt2i.2	⊢ 𝐶 ∈ V

Assertion

Ref	Expression
dmmpt2	⊢ dom 𝐹 = (𝐴 × 𝐵)

Distinct variable groups:   𝑥,𝐴,𝑦   𝑥,𝐵,𝑦

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

Proof of Theorem dmmpt2

Step	Hyp	Ref	Expression
1		fmpt2.1	. . 3 ⊢ 𝐹 = (𝑥 ∈ 𝐴, 𝑦 ∈ 𝐵 ↦ 𝐶)
2		fnmpt2i.2	. . 3 ⊢ 𝐶 ∈ V
3	1, 2	fnmpt2i 7128	. 2 ⊢ 𝐹 Fn (𝐴 × 𝐵)
4		fndm 5904	. 2 ⊢ (𝐹 Fn (𝐴 × 𝐵) → dom 𝐹 = (𝐴 × 𝐵))
5	3, 4	ax-mp 5	1 ⊢ dom 𝐹 = (𝐴 × 𝐵)

Syntax hints:   = wceq 1475   ∈ wcel 1977  Vcvv 3173   × cxp 5036  dom cdm 5038   Fn wfn 5799   ↦ cmpt2 6551

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-8 1979  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pow 4769  ax-pr 4833  ax-un 6847

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ne 2782  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-sbc 3403  df-csb 3500  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-uni 4373  df-iun 4457  df-br 4584  df-opab 4644  df-mpt 4645  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-res 5050  df-ima 5051  df-iota 5768  df-fun 5806  df-fn 5807  df-f 5808  df-fv 5812  df-oprab 6553  df-mpt2 6554  df-1st 7059  df-2nd 7060

This theorem is referenced by:  1div0  10565  swrd00  13270  swrd0  13286  repsundef  13369  cshnz  13389  imasvscafn  16020  imasvscaval  16021  iscnp2  20853  xkococnlem  21272  ucnima  21895  ucnprima  21896  tngtopn  22264  1div0apr  26716  smatlem  29191  elunirnmbfm  29642  pfx00  40247  pfx0  40248