Theorem mtyf 32794

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:𝑉⟶𝐹)

Proof of Theorem mtyf

Step	Hyp	Ref	Expression
1		mtyf.v	. . . 4 ⊢ 𝑉 = (mVR‘𝑇)
2		eqid 2821	. . . 4 ⊢ (mTC‘𝑇) = (mTC‘𝑇)
3		mtyf.y	. . . 4 ⊢ 𝑌 = (mType‘𝑇)
4	1, 2, 3	mtyf2 32793	. . 3 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5		ffn 6509	. . . 4 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6		dffn4 6591	. . . 4 ⊢ (𝑌 Fn 𝑉 ↔ 𝑌:𝑉–onto→ran 𝑌)
7	5, 6	sylib 220	. . 3 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉–onto→ran 𝑌)
8		fof 6585	. . 3 ⊢ (𝑌:𝑉–onto→ran 𝑌 → 𝑌:𝑉⟶ran 𝑌)
9	4, 7, 8	3syl 18	. 2 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶ran 𝑌)
10		mtyf.f	. . . 4 ⊢ 𝐹 = (mVT‘𝑇)
11	10, 3	mvtval 32742	. . 3 ⊢ 𝐹 = ran 𝑌
12		feq3 6492	. . 3 ⊢ (𝐹 = ran 𝑌 → (𝑌:𝑉⟶𝐹 ↔ 𝑌:𝑉⟶ran 𝑌))
13	11, 12	ax-mp 5	. 2 ⊢ (𝑌:𝑉⟶𝐹 ↔ 𝑌:𝑉⟶ran 𝑌)
14	9, 13	sylibr 236	1 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶𝐹)

Syntax hints:   → wi 4   ↔ wb 208   = wceq 1533   ∈ wcel 2110  ran crn 5551   Fn wfn 6345  ⟶wf 6346  –onto→wfo 6348  ‘cfv 6350  mVRcmvar 32703  mTypecmty 32704  mVTcmvt 32705  mTCcmtc 32706  mFScmfs 32718

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2156  ax-12 2172  ax-ext 2793  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5322  ax-un 7455

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3497  df-sbc 3773  df-dif 3939  df-un 3941  df-in 3943  df-ss 3952  df-nul 4292  df-if 4468  df-sn 4562  df-pr 4564  df-op 4568  df-uni 4833  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5455  df-xp 5556  df-rel 5557  df-cnv 5558  df-co 5559  df-dm 5560  df-rn 5561  df-res 5562  df-ima 5563  df-iota 6309  df-fun 6352  df-fn 6353  df-f 6354  df-fo 6356  df-fv 6358  df-mvt 32727  df-mfs 32738

This theorem is referenced by: (None)