elhoi - Mathbox for Glauco Siliprandi

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Theorem elhoi 40756

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 6680	. . 3 ⊢ (𝜑 → (𝐴[,)𝐵) ∈ V)
2		elhoi.1	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑉)
3		elmapg 7870	. . 3 ⊢ (((𝐴[,)𝐵) ∈ V ∧ 𝑋 ∈ 𝑉) → (𝑌 ∈ ((𝐴[,)𝐵) ↑_𝑚 𝑋) ↔ 𝑌:𝑋⟶(𝐴[,)𝐵)))
4	1, 2, 3	syl2anc 693	. 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 12258	. . . . . . 7 ⊢ (𝐴[,)𝐵) ⊆ ℝ^*
7	6	a1i 11	. . . . . 6 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → (𝐴[,)𝐵) ⊆ ℝ^*)
8	5, 7	fssd 6057	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → 𝑌:𝑋⟶ℝ^*)
9		ffvelrn 6357	. . . . . 6 ⊢ ((𝑌:𝑋⟶(𝐴[,)𝐵) ∧ 𝑥 ∈ 𝑋) → (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
10	9	ralrimiva 2966	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
11	8, 10	jca 554	. . . 4 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) → (𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
12		ffn 6045	. . . . . . 7 ⊢ (𝑌:𝑋⟶ℝ^* → 𝑌 Fn 𝑋)
13	12	adantr 481	. . . . . 6 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → 𝑌 Fn 𝑋)
14		simpr 477	. . . . . 6 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵))
15	13, 14	jca 554	. . . . 5 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → (𝑌 Fn 𝑋 ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
16		ffnfv 6388	. . . . 5 ⊢ (𝑌:𝑋⟶(𝐴[,)𝐵) ↔ (𝑌 Fn 𝑋 ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)))
17	15, 16	sylibr 224	. . . 4 ⊢ ((𝑌:𝑋⟶ℝ^* ∧ ∀𝑥 ∈ 𝑋 (𝑌‘𝑥) ∈ (𝐴[,)𝐵)) → 𝑌:𝑋⟶(𝐴[,)𝐵))
18	11, 17	impbii 199	. . 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 268	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 196 ∧ wa 384 ∈ wcel 1990 ∀wral 2912 Vcvv 3200 ⊆ wss 3574 Fn wfn 5883 ⟶wf 5884 ‘cfv 5888 (class class class)co 6650 ↑_𝑚 cmap 7857 ℝ^*cxr 10073 [,)cico 12177

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 ax-cnex 9992 ax-resscn 9993

This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-sbc 3436 df-csb 3534 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-iun 4522 df-br 4654 df-opab 4713 df-mpt 4730 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-iota 5851 df-fun 5890 df-fn 5891 df-f 5892 df-fv 5896 df-ov 6653 df-oprab 6654 df-mpt2 6655 df-1st 7168 df-2nd 7169 df-map 7859 df-xr 10078 df-ico 12181

This theorem is referenced by: (None)

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