Theorem restfn 17356

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 17354	. 2 ⊢ ↾t = (𝑗 ∈ V, 𝑥 ∈ V ↦ ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)))
2		vex 3446	. . . 4 ⊢ 𝑗 ∈ V
3	2	mptex 7179	. . 3 ⊢ (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
4	3	rnex 7862	. 2 ⊢ ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
5	1, 4	fnmpoi 8024	1 ⊢ ↾t Fn (V × V)

Syntax hints:  Vcvv 3442   ∩ cin 3902   ↦ cmpt 5181   × cxp 5630  ran crn 5633   Fn wfn 6495   ↾_t crest 17352

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-rep 5226  ax-sep 5243  ax-nul 5253  ax-pr 5379  ax-un 7690

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-reu 3353  df-rab 3402  df-v 3444  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-iun 4950  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-f1 6505  df-fo 6506  df-f1o 6507  df-fv 6508  df-oprab 7372  df-mpo 7373  df-1st 7943  df-2nd 7944  df-rest 17354

This theorem is referenced by:  0rest  17361  restsspw  17363  firest  17364  restrcl  23113  restbas  23114  ssrest  23132  resstopn  23142