Theorem mtyf 31995

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 2825	. . . 4 ⊢ (mTC‘𝑇) = (mTC‘𝑇)
3		mtyf.y	. . . 4 ⊢ 𝑌 = (mType‘𝑇)
4	1, 2, 3	mtyf2 31994	. . 3 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5		ffn 6278	. . . 4 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6		dffn4 6359	. . . 4 ⊢ (𝑌 Fn 𝑉 ↔ 𝑌:𝑉–onto→ran 𝑌)
7	5, 6	sylib 210	. . 3 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉–onto→ran 𝑌)
8		fof 6353	. . 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 31943	. . 3 ⊢ 𝐹 = ran 𝑌
12		feq3 6261	. . 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 226	1 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶𝐹)

Syntax hints:   → wi 4   ↔ wb 198   = wceq 1658   ∈ wcel 2166  ran crn 5343   Fn wfn 6118  ⟶wf 6119  –onto→wfo 6121  ‘cfv 6123  mVRcmvar 31904  mTypecmty 31905  mVTcmvt 31906  mTCcmtc 31907  mFScmfs 31919

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1896  ax-4 1910  ax-5 2011  ax-6 2077  ax-7 2114  ax-8 2168  ax-9 2175  ax-10 2194  ax-11 2209  ax-12 2222  ax-13 2391  ax-ext 2803  ax-sep 5005  ax-nul 5013  ax-pow 5065  ax-pr 5127  ax-un 7209

This theorem depends on definitions:  df-bi 199  df-an 387  df-or 881  df-3an 1115  df-tru 1662  df-ex 1881  df-nf 1885  df-sb 2070  df-mo 2605  df-eu 2640  df-clab 2812  df-cleq 2818  df-clel 2821  df-nfc 2958  df-ral 3122  df-rex 3123  df-rab 3126  df-v 3416  df-sbc 3663  df-dif 3801  df-un 3803  df-in 3805  df-ss 3812  df-nul 4145  df-if 4307  df-sn 4398  df-pr 4400  df-op 4404  df-uni 4659  df-br 4874  df-opab 4936  df-mpt 4953  df-id 5250  df-xp 5348  df-rel 5349  df-cnv 5350  df-co 5351  df-dm 5352  df-rn 5353  df-res 5354  df-ima 5355  df-iota 6086  df-fun 6125  df-fn 6126  df-f 6127  df-fo 6129  df-fv 6131  df-mvt 31928  df-mfs 31939

This theorem is referenced by: (None)