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Theorem mtyf 35734
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 2736 . . . 4 (mTC‘𝑇) = (mTC‘𝑇)
3 mtyf.y . . . 4 𝑌 = (mType‘𝑇)
41, 2, 3mtyf2 35733 . . 3 (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5 ffn 6668 . . . 4 (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6 dffn4 6758 . . . 4 (𝑌 Fn 𝑉𝑌:𝑉onto→ran 𝑌)
75, 6sylib 218 . . 3 (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉onto→ran 𝑌)
8 fof 6752 . . 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 35682 . . 3 𝐹 = ran 𝑌
12 feq3 6648 . . 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 1542  wcel 2114  ran crn 5632   Fn wfn 6493  wf 6494  ontowfo 6496  cfv 6498  mVRcmvar 35643  mTypecmty 35644  mVTcmvt 35645  mTCcmtc 35646  mFScmfs 35658
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 2708  ax-sep 5231  ax-nul 5241  ax-pr 5375  ax-un 7689
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 2539  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2811  df-nfc 2885  df-ne 2933  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4851  df-br 5086  df-opab 5148  df-mpt 5167  df-id 5526  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-iota 6454  df-fun 6500  df-fn 6501  df-f 6502  df-fo 6504  df-fv 6506  df-mvt 35667  df-mfs 35678
This theorem is referenced by: (None)
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