Theorem fnom 6683

Description: Functionality and domain of ordinal multiplication. (Contributed by NM, 26-Aug-1995.) (Revised by Mario Carneiro, 3-Jul-2019.)

Assertion

Ref	Expression
fnom	⊢ ·o Fn (On × On)

Proof of Theorem fnom

Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-omul 6652	. 2 ⊢ ·o = (𝑥 ∈ On, 𝑦 ∈ On ↦ (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦))
2		vex 2816	. . 3 ⊢ 𝑦 ∈ V
3		0ex 4237	. . . 4 ⊢ ∅ ∈ V
4		vex 2816	. . . . 5 ⊢ 𝑥 ∈ V
5		omfnex 6682	. . . . 5 ⊢ (𝑥 ∈ V → (𝑧 ∈ V ↦ (𝑧 +o 𝑥)) Fn V)
6	4, 5	ax-mp 5	. . . 4 ⊢ (𝑧 ∈ V ↦ (𝑧 +o 𝑥)) Fn V
7	3, 6	rdgexg 6620	. . 3 ⊢ (𝑦 ∈ V → (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V)
8	2, 7	ax-mp 5	. 2 ⊢ (rec((𝑧 ∈ V ↦ (𝑧 +o 𝑥)), ∅)‘𝑦) ∈ V
9	1, 8	fnmpoi 6399	1 ⊢ ·o Fn (On × On)

Syntax hints:   ∈ wcel 2203  Vcvv 2813  ∅c0 3508   ↦ cmpt 4171  Oncon0 4484   × cxp 4747   Fn wfn 5347  ‘cfv 5352  (class class class)co 6050  reccrdg 6600   +_o coa 6644   ·_o comu 6645

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-in1 619  ax-in2 620  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-13 2205  ax-14 2206  ax-ext 2214  ax-coll 4225  ax-sep 4228  ax-nul 4236  ax-pow 4287  ax-pr 4322  ax-un 4554  ax-setind 4659

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-fal 1404  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-ne 2413  df-ral 2525  df-rex 2526  df-reu 2527  df-rab 2529  df-v 2815  df-sbc 3043  df-csb 3139  df-dif 3213  df-un 3215  df-in 3217  df-ss 3224  df-nul 3509  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-iun 3993  df-br 4110  df-opab 4172  df-mpt 4173  df-tr 4209  df-id 4414  df-iord 4487  df-on 4489  df-suc 4492  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762  df-iota 5312  df-fun 5354  df-fn 5355  df-f 5356  df-f1 5357  df-fo 5358  df-f1o 5359  df-fv 5360  df-ov 6053  df-oprab 6054  df-mpo 6055  df-1st 6334  df-2nd 6335  df-recs 6536  df-irdg 6601  df-oadd 6651  df-omul 6652

This theorem is referenced by:  dmmulpi  7641