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Theorem mtyf 35520
Description: The type function maps variables to variable typecodes. (Contributed by Mario Carneiro, 18-Jul-2016.)
Hypotheses
Ref Expression
mtyf.v 𝑉 = (mVR‘𝑇)
mtyf.f 𝐹 = (mVT‘𝑇)
mtyf.y 𝑌 = (mType‘𝑇)
Assertion
Ref Expression
mtyf (𝑇 ∈ mFS → 𝑌:𝑉𝐹)

Proof of Theorem mtyf
StepHypRef Expression
1 mtyf.v . . . 4 𝑉 = (mVR‘𝑇)
2 eqid 2740 . . . 4 (mTC‘𝑇) = (mTC‘𝑇)
3 mtyf.y . . . 4 𝑌 = (mType‘𝑇)
41, 2, 3mtyf2 35519 . . 3 (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5 ffn 6747 . . . 4 (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6 dffn4 6840 . . . 4 (𝑌 Fn 𝑉𝑌:𝑉onto→ran 𝑌)
75, 6sylib 218 . . 3 (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉onto→ran 𝑌)
8 fof 6834 . . 3 (𝑌:𝑉onto→ran 𝑌𝑌:𝑉⟶ran 𝑌)
94, 7, 83syl 18 . 2 (𝑇 ∈ mFS → 𝑌:𝑉⟶ran 𝑌)
10 mtyf.f . . . 4 𝐹 = (mVT‘𝑇)
1110, 3mvtval 35468 . . 3 𝐹 = ran 𝑌
12 feq3 6730 . . 3 (𝐹 = ran 𝑌 → (𝑌:𝑉𝐹𝑌:𝑉⟶ran 𝑌))
1311, 12ax-mp 5 . 2 (𝑌:𝑉𝐹𝑌:𝑉⟶ran 𝑌)
149, 13sylibr 234 1 (𝑇 ∈ mFS → 𝑌:𝑉𝐹)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 206   = wceq 1537  wcel 2108  ran crn 5701   Fn wfn 6568  wf 6569  ontowfo 6571  cfv 6573  mVRcmvar 35429  mTypecmty 35430  mVTcmvt 35431  mTCcmtc 35432  mFScmfs 35444
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1793  ax-4 1807  ax-5 1909  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-10 2141  ax-11 2158  ax-12 2178  ax-ext 2711  ax-sep 5317  ax-nul 5324  ax-pr 5447  ax-un 7770
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 847  df-3an 1089  df-tru 1540  df-fal 1550  df-ex 1778  df-nf 1782  df-sb 2065  df-mo 2543  df-eu 2572  df-clab 2718  df-cleq 2732  df-clel 2819  df-nfc 2895  df-ne 2947  df-ral 3068  df-rex 3077  df-rab 3444  df-v 3490  df-dif 3979  df-un 3981  df-in 3983  df-ss 3993  df-nul 4353  df-if 4549  df-sn 4649  df-pr 4651  df-op 4655  df-uni 4932  df-br 5167  df-opab 5229  df-mpt 5250  df-id 5593  df-xp 5706  df-rel 5707  df-cnv 5708  df-co 5709  df-dm 5710  df-rn 5711  df-res 5712  df-ima 5713  df-iota 6525  df-fun 6575  df-fn 6576  df-f 6577  df-fo 6579  df-fv 6581  df-mvt 35453  df-mfs 35464
This theorem is referenced by: (None)
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