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Theorem idcnop 32342
Description: The identity function (restricted to Hilbert space) is a continuous operator. (Contributed by NM, 7-Feb-2006.) (New usage is discouraged.)
Assertion
Ref Expression
idcnop ( I ↾ ℋ) ∈ ContOp

Proof of Theorem idcnop
Dummy variables 𝑥 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 f1oi 6859 . . 3 ( I ↾ ℋ): ℋ–1-1-onto→ ℋ
2 f1of 6820 . . 3 (( I ↾ ℋ): ℋ–1-1-onto→ ℋ → ( I ↾ ℋ): ℋ⟶ ℋ)
31, 2ax-mp 5 . 2 ( I ↾ ℋ): ℋ⟶ ℋ
4 id 23 . . . 4 (𝑦 ∈ ℝ+𝑦 ∈ ℝ+)
5 fvresi 7171 . . . . . . . . 9 (𝑤 ∈ ℋ → (( I ↾ ℋ)‘𝑤) = 𝑤)
6 fvresi 7171 . . . . . . . . 9 (𝑥 ∈ ℋ → (( I ↾ ℋ)‘𝑥) = 𝑥)
75, 6oveqan12rd 7430 . . . . . . . 8 ((𝑥 ∈ ℋ ∧ 𝑤 ∈ ℋ) → ((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥)) = (𝑤 𝑥))
87fveq2d 6885 . . . . . . 7 ((𝑥 ∈ ℋ ∧ 𝑤 ∈ ℋ) → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) = (norm‘(𝑤 𝑥)))
98breq1d 5119 . . . . . 6 ((𝑥 ∈ ℋ ∧ 𝑤 ∈ ℋ) → ((norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦 ↔ (norm‘(𝑤 𝑥)) < 𝑦))
109biimprd 251 . . . . 5 ((𝑥 ∈ ℋ ∧ 𝑤 ∈ ℋ) → ((norm‘(𝑤 𝑥)) < 𝑦 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦))
1110ralrimiva 3157 . . . 4 (𝑥 ∈ ℋ → ∀𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑦 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦))
12 breq2 5113 . . . . 5 (𝑧 = 𝑦 → ((norm‘(𝑤 𝑥)) < 𝑧 ↔ (norm‘(𝑤 𝑥)) < 𝑦))
1312rspceaimv 3587 . . . 4 ((𝑦 ∈ ℝ+ ∧ ∀𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑦 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦)) → ∃𝑧 ∈ ℝ+𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑧 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦))
144, 11, 13syl2anr 608 . . 3 ((𝑥 ∈ ℋ ∧ 𝑦 ∈ ℝ+) → ∃𝑧 ∈ ℝ+𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑧 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦))
1514rgen2 3205 . 2 𝑥 ∈ ℋ ∀𝑦 ∈ ℝ+𝑧 ∈ ℝ+𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑧 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦)
16 elcnop 32218 . 2 (( I ↾ ℋ) ∈ ContOp ↔ (( I ↾ ℋ): ℋ⟶ ℋ ∧ ∀𝑥 ∈ ℋ ∀𝑦 ∈ ℝ+𝑧 ∈ ℝ+𝑤 ∈ ℋ ((norm‘(𝑤 𝑥)) < 𝑧 → (norm‘((( I ↾ ℋ)‘𝑤) − (( I ↾ ℋ)‘𝑥))) < 𝑦)))
173, 15, 16mpbir2an 723 1 ( I ↾ ℋ) ∈ ContOp
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 400  wcel 2143  wral 3079  wrex 3089   class class class wbr 5109   I cid 5555  cres 5663  wf 6532  1-1-ontowf1o 6535  cfv 6536  (class class class)co 7410   < clt 11247  +crp 13020  chba 31280  normcno 31284   cmv 31286  ContOpccop 31307
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-pow 5336  ax-pr 5404  ax-un 7732  ax-hilex 31360
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-sbc 3745  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-pw 4564  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-br 5110  df-opab 5174  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-ima 5674  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-f1 6541  df-fo 6542  df-f1o 6543  df-fv 6544  df-ov 7413  df-oprab 7414  df-mpo 7415  df-map 8822  df-cnop 32201
This theorem is used by:  nmcopex  32390  nmcoplb  32391
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