elhoi - Mathbox for Glauco Siliprandi

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Theorem elhoi 45853

Description: Membership in a multidimensional half-open interval. (Contributed by Glauco Siliprandi, 11-Oct-2020.)

**Hypothesis**
Ref	Expression
elhoi.1	⊢ (𝜑 → 𝑋 ∈ 𝑉)

**Assertion**
Ref	Expression
elhoi	⊢ (𝜑 → (𝑌 ∈ ((𝐴[,)𝐵) ↑_m 𝑋) ↔ (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))))

Distinct variable groups: 𝑥,𝐴 𝑥,𝐵 𝑥,𝑋 𝑥,𝑌 Allowed substitution hints: 𝜑(𝑥) 𝑉(𝑥)

**Proof of Theorem elhoi**
Step	Hyp	Ref	Expression
1		ovexd 7449	. . 3 ⊢ (𝜑 → (𝐴[,)𝐵) ∈ V)
2		elhoi.1	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
3		elmapg 8849	. . 3 ⊢ (((𝐴[,)𝐵) ∈ V ∧ 𝑋 ∈ 𝑉) → (𝑌 ∈ ((𝐴[,)𝐵) ↑_m 𝑋) ↔ 𝑌:𝑋⟶(𝐴[,)𝐵)))
4	1, 2, 3	syl2anc 583	. 2 ⊢ (𝜑 → (𝑌 ∈ ((𝐴[,)𝐵) ↑_m 𝑋) ↔ 𝑌:𝑋⟶(𝐴[,)𝐵)))
5		id 22	. . . . . 6 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → 𝑌:𝑋⟶(𝐴[,)𝐵))
6		icossxr 13433	. . . . . . 7 ⊢ (𝐴[,)𝐵) ⊆ ℝ^*
7	6	a1i 11	. . . . . 6 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → (𝐴[,)𝐵) ⊆ ℝ^*)
8	5, 7	fssd 6734	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → 𝑌:𝑋⟶ℝ^*)
9		ffvelcdm 7085	. . . . . 6 ⊢ ((𝑌:𝑋⟶(𝐴[,)𝐵) ∧ 𝑥 ∈ 𝑋) → (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
10	9	ralrimiva 3141	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
11	8, 10	jca 511	. . . 4 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
12		ffn 6716	. . . . . . 7 ⊢ (𝑌:𝑋⟶ℝ^* → 𝑌 Fn 𝑋)
13	12	adantr 480	. . . . . 6 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → 𝑌 Fn 𝑋)
14		simpr 484	. . . . . 6 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
15	13, 14	jca 511	. . . . 5 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → (𝑌 Fn 𝑋 ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
16		ffnfv 7123	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) ↔ (𝑌 Fn 𝑋 ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
17	15, 16	sylibr 233	. . . 4 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → 𝑌:𝑋⟶(𝐴[,)𝐵))
18	11, 17	impbii 208	. . 3 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) ↔ (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
19	18	a1i 11	. 2 ⊢ (𝜑 → (𝑌:𝑋⟶(𝐴[,)𝐵) ↔ (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))))
20	4, 19	bitrd 279	1 ⊢ (𝜑 → (𝑌 ∈ ((𝐴[,)𝐵) ↑_m 𝑋) ↔ (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∈ wcel 2099 ∀wral 3056 Vcvv 3469 ⊆ wss 3944 Fn wfn 6537 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 ↑_m cmap 8836 ℝ^*cxr 11269 [,)cico 13350

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2164 ax-ext 2698 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11186 ax-resscn 11187

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2705 df-cleq 2719 df-clel 2805 df-nfc 2880 df-ne 2936 df-ral 3057 df-rex 3066 df-rab 3428 df-v 3471 df-sbc 3775 df-csb 3890 df-dif 3947 df-un 3949 df-in 3951 df-ss 3961 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-fv 6550 df-ov 7417 df-oprab 7418 df-mpo 7419 df-1st 7987 df-2nd 7988 df-map 8838 df-xr 11274 df-ico 13354

This theorem is referenced by: (None)

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