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Theorem restfn 17588
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.
StepHypRef Expression
1 df-rest 17586 . 2 ↾t = (𝑗 ∈ V, 𝑥 ∈ V ↦ ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)))
2 vex 3455 . . . 4 𝑗 ∈ V
32mptex 7227 . . 3 (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
43rnex 7920 . 2 ran (𝑦 ∈ 𝑗 ↦ (𝑦 ∩ 𝑥)) ∈ V
51, 4fnmpoi 8079 1 ↾t Fn (V × V)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  Vcvv 3451   ∩ cin 3898   ↦ cmpt 5186   × cxp 5649  ran crn 5652   Fn wfn 6532   ↾t crest 17584
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-rep 5232  ax-sep 5249  ax-nul 5260  ax-pr 5391  ax-un 7749
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ne 2957  df-ral 3078  df-rex 3088  df-reu 3367  df-rab 3414  df-v 3453  df-sbc 3740  df-csb 3848  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-iun 4953  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-oprab 7422  df-mpo 7423  df-1st 7999  df-2nd 8000  df-rest 17586
This theorem is used by:  0rest  17593  restsspw  17595  firest  17596  restrcl  23468  restbas  23469  ssrest  23487  resstopn  23497
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