Theorem mtyf 32912

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 2798	. . . 4 ⊢ (mTC‘𝑇) = (mTC‘𝑇)
3		mtyf.y	. . . 4 ⊢ 𝑌 = (mType‘𝑇)
4	1, 2, 3	mtyf2 32911	. . 3 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5		ffn 6487	. . . 4 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6		dffn4 6571	. . . 4 ⊢ (𝑌 Fn 𝑉 ↔ 𝑌:𝑉–onto→ran 𝑌)
7	5, 6	sylib 221	. . 3 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉–onto→ran 𝑌)
8		fof 6565	. . 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 32860	. . 3 ⊢ 𝐹 = ran 𝑌
12		feq3 6470	. . 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 237	1 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶𝐹)

Syntax hints:   → wi 4   ↔ wb 209   = wceq 1538   ∈ wcel 2111  ran crn 5520   Fn wfn 6319  ⟶wf 6320  –onto→wfo 6322  ‘cfv 6324  mVRcmvar 32821  mTypecmty 32822  mVTcmvt 32823  mTCcmtc 32824  mFScmfs 32836

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 1911  ax-6 1970  ax-7 2015  ax-8 2113  ax-9 2121  ax-10 2142  ax-11 2158  ax-12 2175  ax-ext 2770  ax-sep 5167  ax-nul 5174  ax-pow 5231  ax-pr 5295  ax-un 7441

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2598  df-eu 2629  df-clab 2777  df-cleq 2791  df-clel 2870  df-nfc 2938  df-ral 3111  df-rex 3112  df-rab 3115  df-v 3443  df-sbc 3721  df-dif 3884  df-un 3886  df-in 3888  df-ss 3898  df-nul 4244  df-if 4426  df-sn 4526  df-pr 4528  df-op 4532  df-uni 4801  df-br 5031  df-opab 5093  df-mpt 5111  df-id 5425  df-xp 5525  df-rel 5526  df-cnv 5527  df-co 5528  df-dm 5529  df-rn 5530  df-res 5531  df-ima 5532  df-iota 6283  df-fun 6326  df-fn 6327  df-f 6328  df-fo 6330  df-fv 6332  df-mvt 32845  df-mfs 32856

This theorem is referenced by: (None)