Theorem restfn 17052

Description: The subspace topology operator is a function on pairs. (Contributed by Mario Carneiro, 1-May-2015.)

Assertion

Ref	Expression
restfn	⊢ ↾t Fn (V × V)

Proof of Theorem restfn

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

Step	Hyp	Ref	Expression
1		df-rest 17050	. 2 ⊢ ↾t = (𝑗 ∈ V, 𝑥 ∈ V ↦ ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)))
2		vex 3426	. . . 4 ⊢ 𝑗 ∈ V
3	2	mptex 7081	. . 3 ⊢ (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
4	3	rnex 7733	. 2 ⊢ ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
5	1, 4	fnmpoi 7883	1 ⊢ ↾t Fn (V × V)

Syntax hints:  Vcvv 3422   ∩ cin 3882   ↦ cmpt 5153   × cxp 5578  ran crn 5581   Fn wfn 6413   ↾_t crest 17048

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pr 5347  ax-un 7566

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-ral 3068  df-rex 3069  df-reu 3070  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-sn 4559  df-pr 4561  df-op 4565  df-uni 4837  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-id 5480  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-oprab 7259  df-mpo 7260  df-1st 7804  df-2nd 7805  df-rest 17050

This theorem is referenced by:  0rest  17057  restsspw  17059  firest  17060  restrcl  22216  restbas  22217  ssrest  22235  resstopn  22245