eliooshift - Mathbox for Glauco Siliprandi

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Theorem eliooshift 41324

Description: Element of an open interval shifted by a displacement. (Contributed by Glauco Siliprandi, 11-Dec-2019.)

**Hypotheses**
Ref	Expression
eliooshift.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
eliooshift.b	⊢ (𝜑 → 𝐵 ∈ ℝ)
eliooshift.c	⊢ (𝜑 → 𝐶 ∈ ℝ)
eliooshift.d	⊢ (𝜑 → 𝐷 ∈ ℝ)

**Assertion**
Ref	Expression
eliooshift	⊢ (𝜑 → (𝐴 ∈ (𝐵(,)𝐶) ↔ (𝐴 + 𝐷) ∈ ((𝐵 + 𝐷)(,)(𝐶 + 𝐷))))

**Proof of Theorem eliooshift**
Step	Hyp	Ref	Expression
1		eliooshift.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ ℝ)
2		eliooshift.d	. . . . 5 ⊢ (𝜑 → 𝐷 ∈ ℝ)
3	1, 2	readdcld 10516	. . . 4 ⊢ (𝜑 → (𝐴 + 𝐷) ∈ ℝ)
4	3, 1	2thd 266	. . 3 ⊢ (𝜑 → ((𝐴 + 𝐷) ∈ ℝ ↔ 𝐴 ∈ ℝ))
5		eliooshift.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ)
6	5, 1, 2	ltadd1d 11081	. . . 4 ⊢ (𝜑 → (𝐵 < 𝐴 ↔ (𝐵 + 𝐷) < (𝐴 + 𝐷)))
7	6	bicomd 224	. . 3 ⊢ (𝜑 → ((𝐵 + 𝐷) < (𝐴 + 𝐷) ↔ 𝐵 < 𝐴))
8		eliooshift.c	. . . . 5 ⊢ (𝜑 → 𝐶 ∈ ℝ)
9	1, 8, 2	ltadd1d 11081	. . . 4 ⊢ (𝜑 → (𝐴 < 𝐶 ↔ (𝐴 + 𝐷) < (𝐶 + 𝐷)))
10	9	bicomd 224	. . 3 ⊢ (𝜑 → ((𝐴 + 𝐷) < (𝐶 + 𝐷) ↔ 𝐴 < 𝐶))
11	4, 7, 10	3anbi123d 1428	. 2 ⊢ (𝜑 → (((𝐴 + 𝐷) ∈ ℝ ∧ (𝐵 + 𝐷) < (𝐴 + 𝐷) ∧ (𝐴 + 𝐷) < (𝐶 + 𝐷)) ↔ (𝐴 ∈ ℝ ∧ 𝐵 < 𝐴 ∧ 𝐴 < 𝐶)))
12	5, 2	readdcld 10516	. . . 4 ⊢ (𝜑 → (𝐵 + 𝐷) ∈ ℝ)
13	12	rexrd 10537	. . 3 ⊢ (𝜑 → (𝐵 + 𝐷) ∈ ℝ^*)
14	8, 2	readdcld 10516	. . . 4 ⊢ (𝜑 → (𝐶 + 𝐷) ∈ ℝ)
15	14	rexrd 10537	. . 3 ⊢ (𝜑 → (𝐶 + 𝐷) ∈ ℝ^*)
16		elioo2 12629	. . 3 ⊢ (((𝐵 + 𝐷) ∈ ℝ^* ∧ (𝐶 + 𝐷) ∈ ℝ^*) → ((𝐴 + 𝐷) ∈ ((𝐵 + 𝐷)(,)(𝐶 + 𝐷)) ↔ ((𝐴 + 𝐷) ∈ ℝ ∧ (𝐵 + 𝐷) < (𝐴 + 𝐷) ∧ (𝐴 + 𝐷) < (𝐶 + 𝐷))))
17	13, 15, 16	syl2anc 584	. 2 ⊢ (𝜑 → ((𝐴 + 𝐷) ∈ ((𝐵 + 𝐷)(,)(𝐶 + 𝐷)) ↔ ((𝐴 + 𝐷) ∈ ℝ ∧ (𝐵 + 𝐷) < (𝐴 + 𝐷) ∧ (𝐴 + 𝐷) < (𝐶 + 𝐷))))
18	5	rexrd 10537	. . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
19	8	rexrd 10537	. . 3 ⊢ (𝜑 → 𝐶 ∈ ℝ^*)
20		elioo2 12629	. . 3 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐴 ∈ (𝐵(,)𝐶) ↔ (𝐴 ∈ ℝ ∧ 𝐵 < 𝐴 ∧ 𝐴 < 𝐶)))
21	18, 19, 20	syl2anc 584	. 2 ⊢ (𝜑 → (𝐴 ∈ (𝐵(,)𝐶) ↔ (𝐴 ∈ ℝ ∧ 𝐵 < 𝐴 ∧ 𝐴 < 𝐶)))
22	11, 17, 21	3bitr4rd 313	1 ⊢ (𝜑 → (𝐴 ∈ (𝐵(,)𝐶) ↔ (𝐴 + 𝐷) ∈ ((𝐵 + 𝐷)(,)(𝐶 + 𝐷))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 207 ∧ w3a 1080 ∈ wcel 2081 class class class wbr 4962 (class class class)co 7016 ℝcr 10382 + caddc 10386 ℝ^*cxr 10520 < clt 10521 (,)cioo 12588

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1777 ax-4 1791 ax-5 1888 ax-6 1947 ax-7 1992 ax-8 2083 ax-9 2091 ax-10 2112 ax-11 2126 ax-12 2141 ax-13 2344 ax-ext 2769 ax-sep 5094 ax-nul 5101 ax-pow 5157 ax-pr 5221 ax-un 7319 ax-cnex 10439 ax-resscn 10440 ax-1cn 10441 ax-icn 10442 ax-addcl 10443 ax-addrcl 10444 ax-mulcl 10445 ax-mulrcl 10446 ax-mulcom 10447 ax-addass 10448 ax-mulass 10449 ax-distr 10450 ax-i2m1 10451 ax-1ne0 10452 ax-1rid 10453 ax-rnegex 10454 ax-rrecex 10455 ax-cnre 10456 ax-pre-lttri 10457 ax-pre-lttrn 10458 ax-pre-ltadd 10459

This theorem depends on definitions: df-bi 208 df-an 397 df-or 843 df-3or 1081 df-3an 1082 df-tru 1525 df-ex 1762 df-nf 1766 df-sb 2043 df-mo 2576 df-eu 2612 df-clab 2776 df-cleq 2788 df-clel 2863 df-nfc 2935 df-ne 2985 df-nel 3091 df-ral 3110 df-rex 3111 df-rab 3114 df-v 3439 df-sbc 3707 df-csb 3812 df-dif 3862 df-un 3864 df-in 3866 df-ss 3874 df-nul 4212 df-if 4382 df-pw 4455 df-sn 4473 df-pr 4475 df-op 4479 df-uni 4746 df-iun 4827 df-br 4963 df-opab 5025 df-mpt 5042 df-id 5348 df-po 5362 df-so 5363 df-xp 5449 df-rel 5450 df-cnv 5451 df-co 5452 df-dm 5453 df-rn 5454 df-res 5455 df-ima 5456 df-iota 6189 df-fun 6227 df-fn 6228 df-f 6229 df-f1 6230 df-fo 6231 df-f1o 6232 df-fv 6233 df-ov 7019 df-oprab 7020 df-mpo 7021 df-1st 7545 df-2nd 7546 df-er 8139 df-en 8358 df-dom 8359 df-sdom 8360 df-pnf 10523 df-mnf 10524 df-xr 10525 df-ltxr 10526 df-le 10527 df-ioo 12592

This theorem is referenced by: fourierdlem88 42021

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