Theorem mtyf 35772

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 2737	. . . 4 ⊢ (mTC‘𝑇) = (mTC‘𝑇)
3		mtyf.y	. . . 4 ⊢ 𝑌 = (mType‘𝑇)
4	1, 2, 3	mtyf2 35771	. . 3 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶(mTC‘𝑇))
5		ffn 6670	. . . 4 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌 Fn 𝑉)
6		dffn4 6760	. . . 4 ⊢ (𝑌 Fn 𝑉 ↔ 𝑌:𝑉–onto→ran 𝑌)
7	5, 6	sylib 218	. . 3 ⊢ (𝑌:𝑉⟶(mTC‘𝑇) → 𝑌:𝑉–onto→ran 𝑌)
8		fof 6754	. . 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 35720	. . 3 ⊢ 𝐹 = ran 𝑌
12		feq3 6650	. . 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 234	1 ⊢ (𝑇 ∈ mFS → 𝑌:𝑉⟶𝐹)

Syntax hints:   → wi 4   ↔ wb 206   = wceq 1542   ∈ wcel 2114  ran crn 5633   Fn wfn 6495  ⟶wf 6496  –onto→wfo 6498  ‘cfv 6500  mVRcmvar 35681  mTypecmty 35682  mVTcmvt 35683  mTCcmtc 35684  mFScmfs 35696

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 2709  ax-sep 5243  ax-nul 5253  ax-pr 5379  ax-un 7690

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 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ne 2934  df-ral 3053  df-rex 3063  df-rab 3402  df-v 3444  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4288  df-if 4482  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5527  df-xp 5638  df-rel 5639  df-cnv 5640  df-co 5641  df-dm 5642  df-rn 5643  df-res 5644  df-ima 5645  df-iota 6456  df-fun 6502  df-fn 6503  df-f 6504  df-fo 6506  df-fv 6508  df-mvt 35705  df-mfs 35716

This theorem is referenced by: (None)