Theorem hocofi 28009

Description: Mapping of composition of Hilbert space operators. (Contributed by NM, 14-Nov-2000.) (New usage is discouraged.)

Hypotheses

Ref	Expression
hoeq.1	⊢ 𝑆: ℋ⟶ ℋ
hoeq.2	⊢ 𝑇: ℋ⟶ ℋ

Assertion

Ref	Expression
hocofi	⊢ (𝑆 ∘ 𝑇): ℋ⟶ ℋ

Proof of Theorem hocofi

Step	Hyp	Ref	Expression
1		hoeq.1	. 2 ⊢ 𝑆: ℋ⟶ ℋ
2		hoeq.2	. 2 ⊢ 𝑇: ℋ⟶ ℋ
3		fco 5971	. 2 ⊢ ((𝑆: ℋ⟶ ℋ ∧ 𝑇: ℋ⟶ ℋ) → (𝑆 ∘ 𝑇): ℋ⟶ ℋ)
4	1, 2, 3	mp2an 704	1 ⊢ (𝑆 ∘ 𝑇): ℋ⟶ ℋ

Syntax hints:   ∘ ccom 5042  ⟶wf 5800   ℋchil 27160

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rex 2902  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-id 4953  df-xp 5044  df-rel 5045  df-cnv 5046  df-co 5047  df-dm 5048  df-rn 5049  df-fun 5806  df-fn 5807  df-f 5808

This theorem is referenced by:  hocofni  28010  hocadddiri  28022  hocsubdiri  28023  ho2coi  28024  ho0coi  28031  hoid1i  28032  hoid1ri  28033  hoddii  28232  lnopcoi  28246  bdopcoi  28341  adjcoi  28343  nmopcoadji  28344  unierri  28347  pjsdii  28398  pjddii  28399  pjsdi2i  28400  pjss1coi  28406  pjss2coi  28407  pjorthcoi  28412  pjinvari  28434  pjclem1  28438  pjclem4  28442  pjadj2coi  28447  pj3lem1  28449  pj3si  28450  pj3cor1i  28452