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Theorem pjmfn 32374
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.
StepHypRef Expression
1 ax-hilex 31658 . . 3 ℋ ∈ V
21mptex 7260 . 2 (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))) ∈ V
3 df-pjh 32054 . 2 projℎ = (ℎ ∈ Cℋ ↦ (𝑥 ∈ ℋ ↦ (℩𝑧 ∈ ℎ ∃𝑦 ∈ (⊥‘ℎ)𝑥 = (𝑧 +ℎ 𝑦))))
42, 3fnmpti 6712 1 projℎ Fn Cℋ
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  ∃wrex 3090   ↦ cmpt 5192   Fn wfn 6561  ‘cfv 6566  ℩crio 7407  (class class class)co 7451   ℋchba 31578   +ℎ cva 31579   Cℋ cch 31588  ⊥cort 31589  projℎcpjh 31596
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-rep 5238  ax-sep 5255  ax-nul 5266  ax-pr 5398  ax-hilex 31658
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ne 2960  df-ral 3081  df-rex 3091  df-reu 3370  df-rab 3417  df-v 3456  df-sbc 3743  df-csb 3852  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4841  df-uni 4873  df-iun 4958  df-br 5109  df-opab 5174  df-mpt 5193  df-id 5553  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-iota 6520  df-fun 6568  df-fn 6569  df-f 6570  df-f1 6571  df-fo 6572  df-f1o 6573  df-fv 6574  df-pjh 32054
This theorem is used by:  pjmf1  32375  pjssdif1i  32834  dfpjop  32841  pjadj3  32847  pjcmul1i  32860  pjcmul2i  32861
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