Theorem pjmfn 30306

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 29590	. . 3 ⊢ ℋ ∈ V
2	1	mptex 7149	. 2 ⊢ (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))) ∈ V
3		df-pjh 29986	. 2 ⊢ projℎ = (ℎ ∈ Cℋ ↦ (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))))
4	2, 3	fnmpti 6621	1 ⊢ projℎ Fn Cℋ

Syntax hints:   = wceq 1540  ∃wrex 3070   ↦ cmpt 5172   Fn wfn 6468  ‘cfv 6473  ℩crio 7285  (class class class)co 7329   ℋchba 29510   +_ℎ cva 29511   C_ℋ cch 29520  ⊥cort 29521  proj_ℎcpjh 29528

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1912  ax-6 1970  ax-7 2010  ax-8 2107  ax-9 2115  ax-10 2136  ax-11 2153  ax-12 2170  ax-ext 2707  ax-rep 5226  ax-sep 5240  ax-nul 5247  ax-pr 5369  ax-hilex 29590

This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1781  df-nf 1785  df-sb 2067  df-mo 2538  df-eu 2567  df-clab 2714  df-cleq 2728  df-clel 2814  df-nfc 2886  df-ne 2941  df-ral 3062  df-rex 3071  df-reu 3350  df-rab 3404  df-v 3443  df-sbc 3727  df-csb 3843  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4269  df-if 4473  df-sn 4573  df-pr 4575  df-op 4579  df-uni 4852  df-iun 4940  df-br 5090  df-opab 5152  df-mpt 5173  df-id 5512  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-iota 6425  df-fun 6475  df-fn 6476  df-f 6477  df-f1 6478  df-fo 6479  df-f1o 6480  df-fv 6481  df-pjh 29986

This theorem is referenced by:  pjmf1  30307  pjssdif1i  30766  dfpjop  30773  pjadj3  30779  pjcmul1i  30792  pjcmul2i  30793