Theorem pjmfn 29486

Description: Functionality of the projection function. (Contributed by NM, 24-Apr-2006.) (New usage is discouraged.)

Assertion

Ref	Expression
pjmfn	⊢ projℎ Fn Cℋ

Proof of Theorem pjmfn

Dummy variables 𝑥 ℎ 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		ax-hilex 28770	. . 3 ⊢ ℋ ∈ V
2	1	mptex 6980	. 2 ⊢ (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))) ∈ V
3		df-pjh 29166	. 2 ⊢ projℎ = (ℎ ∈ Cℋ ↦ (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))))
4	2, 3	fnmpti 6485	1 ⊢ projℎ Fn Cℋ

Syntax hints:   = wceq 1533  ∃wrex 3139   ↦ cmpt 5138   Fn wfn 6344  ‘cfv 6349  ℩crio 7107  (class class class)co 7150   ℋchba 28690   +_ℎ cva 28691   C_ℋ cch 28700  ⊥cort 28701  proj_ℎcpjh 28708

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 2157  ax-12 2173  ax-ext 2793  ax-rep 5182  ax-sep 5195  ax-nul 5202  ax-pr 5321  ax-hilex 28770

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-ne 3017  df-ral 3143  df-rex 3144  df-reu 3145  df-rab 3147  df-v 3496  df-sbc 3772  df-csb 3883  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-iun 4913  df-br 5059  df-opab 5121  df-mpt 5139  df-id 5454  df-xp 5555  df-rel 5556  df-cnv 5557  df-co 5558  df-dm 5559  df-rn 5560  df-res 5561  df-ima 5562  df-iota 6308  df-fun 6351  df-fn 6352  df-f 6353  df-f1 6354  df-fo 6355  df-f1o 6356  df-fv 6357  df-pjh 29166

This theorem is referenced by:  pjmf1  29487  pjssdif1i  29946  dfpjop  29953  pjadj3  29959  pjcmul1i  29972  pjcmul2i  29973