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Theorem pjf 20931
Description: A projection is a function on the base set. (Contributed by Mario Carneiro, 16-Oct-2015.)
Hypotheses
Ref Expression
pjf.k 𝐾 = (proj‘𝑊)
pjf.v 𝑉 = (Base‘𝑊)
Assertion
Ref Expression
pjf (𝑇 ∈ dom 𝐾 → (𝐾𝑇):𝑉𝑉)

Proof of Theorem pjf
StepHypRef Expression
1 pjf.v . . . 4 𝑉 = (Base‘𝑊)
2 eqid 2740 . . . 4 (LSubSp‘𝑊) = (LSubSp‘𝑊)
3 eqid 2740 . . . 4 (ocv‘𝑊) = (ocv‘𝑊)
4 eqid 2740 . . . 4 (proj1𝑊) = (proj1𝑊)
5 pjf.k . . . 4 𝐾 = (proj‘𝑊)
61, 2, 3, 4, 5pjdm 20925 . . 3 (𝑇 ∈ dom 𝐾 ↔ (𝑇 ∈ (LSubSp‘𝑊) ∧ (𝑇(proj1𝑊)((ocv‘𝑊)‘𝑇)):𝑉𝑉))
76simprbi 497 . 2 (𝑇 ∈ dom 𝐾 → (𝑇(proj1𝑊)((ocv‘𝑊)‘𝑇)):𝑉𝑉)
83, 4, 5pjval 20928 . . 3 (𝑇 ∈ dom 𝐾 → (𝐾𝑇) = (𝑇(proj1𝑊)((ocv‘𝑊)‘𝑇)))
98feq1d 6583 . 2 (𝑇 ∈ dom 𝐾 → ((𝐾𝑇):𝑉𝑉 ↔ (𝑇(proj1𝑊)((ocv‘𝑊)‘𝑇)):𝑉𝑉))
107, 9mpbird 256 1 (𝑇 ∈ dom 𝐾 → (𝐾𝑇):𝑉𝑉)
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  wcel 2110  dom cdm 5590  wf 6428  cfv 6432  (class class class)co 7272  Basecbs 16923  proj1cpj1 19251  LSubSpclss 20204  ocvcocv 20876  projcpj 20918
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2015  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2711  ax-sep 5227  ax-nul 5234  ax-pow 5292  ax-pr 5356  ax-un 7583
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 845  df-3an 1088  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2072  df-mo 2542  df-eu 2571  df-clab 2718  df-cleq 2732  df-clel 2818  df-nfc 2891  df-ral 3071  df-rex 3072  df-rab 3075  df-v 3433  df-sbc 3721  df-dif 3895  df-un 3897  df-in 3899  df-ss 3909  df-nul 4263  df-if 4466  df-pw 4541  df-sn 4568  df-pr 4570  df-op 4574  df-uni 4846  df-br 5080  df-opab 5142  df-mpt 5163  df-id 5490  df-xp 5596  df-rel 5597  df-cnv 5598  df-co 5599  df-dm 5600  df-rn 5601  df-res 5602  df-ima 5603  df-iota 6390  df-fun 6434  df-fn 6435  df-f 6436  df-fv 6440  df-ov 7275  df-oprab 7276  df-mpo 7277  df-map 8609  df-pj 20921
This theorem is referenced by: (None)
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