xlesubadd - Metamath Proof Explorer

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Theorem xlesubadd 12659

Description: Under certain conditions, the conclusion of lesubadd 11114 is true even in the extended reals. (Contributed by Mario Carneiro, 4-Sep-2015.)

**Assertion**
Ref	Expression
xlesubadd	⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))

**Proof of Theorem xlesubadd**
Step	Hyp	Ref	Expression
1		simpl1 1187	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ∈ ℝ^)
2		simpl2 1188	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ∈ ℝ^)
3		xnegcl 12609	. . . . . . 7 ⊢ (𝐵 ∈ ℝ^* → -_𝑒𝐵 ∈ ℝ^*)
4	2, 3	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → -_𝑒𝐵 ∈ ℝ^)
5		xaddcl 12635	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ -_𝑒𝐵 ∈ ℝ^) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
6	1, 4, 5	syl2anc 586	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
7	6	adantr 483	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
8		simpll3 1210	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐶 ∈ ℝ^)
9		simpr 487	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
10		xleadd1 12651	. . . 4 ⊢ (((𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^* ∧ 𝐶 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) ≤ (𝐶 +_𝑒 𝐵)))
11	7, 8, 9, 10	syl3anc 1367	. . 3 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) ≤ (𝐶 +_𝑒 𝐵)))
12		xnpcan 12648	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
13	1, 12	sylan 582	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
14	13	breq1d 5078	. . 3 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → (((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) ≤ (𝐶 +_𝑒 𝐵) ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
15	11, 14	bitrd 281	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
16		simpr3 1192	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 0 ≤ 𝐶)
17		oveq1 7165	. . . . . . . . 9 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = (+∞ +_𝑒 -∞))
18		pnfaddmnf 12626	. . . . . . . . 9 ⊢ (+∞ +_𝑒 -∞) = 0
19	17, 18	syl6eq 2874	. . . . . . . 8 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = 0)
20	19	breq1d 5078	. . . . . . 7 ⊢ (𝐴 = +∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 0 ≤ 𝐶))
21	16, 20	syl5ibrcom 249	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 = +∞ → (𝐴 +_𝑒 -∞) ≤ 𝐶))
22		xaddmnf1 12624	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≠ +∞) → (𝐴 +_𝑒 -∞) = -∞)
23	22	ex 415	. . . . . . . 8 ⊢ (𝐴 ∈ ℝ^* → (𝐴 ≠ +∞ → (𝐴 +_𝑒 -∞) = -∞))
24	1, 23	syl 17	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 ≠ +∞ → (𝐴 +_𝑒 -∞) = -∞))
25		simpl3 1189	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ∈ ℝ^)
26		mnfle 12532	. . . . . . . . 9 ⊢ (𝐶 ∈ ℝ^* → -∞ ≤ 𝐶)
27	25, 26	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → -∞ ≤ 𝐶)
28		breq1 5071	. . . . . . . 8 ⊢ ((𝐴 +_𝑒 -∞) = -∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ -∞ ≤ 𝐶))
29	27, 28	syl5ibrcom 249	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -∞) = -∞ → (𝐴 +_𝑒 -∞) ≤ 𝐶))
30	24, 29	syld 47	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 ≠ +∞ → (𝐴 +_𝑒 -∞) ≤ 𝐶))
31	21, 30	pm2.61dne 3105	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -∞) ≤ 𝐶)
32		pnfge 12528	. . . . . . 7 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ≤ +∞)
33	1, 32	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ +∞)
34		ge0nemnf 12569	. . . . . . . 8 ⊢ ((𝐶 ∈ ℝ^* ∧ 0 ≤ 𝐶) → 𝐶 ≠ -∞)
35	25, 16, 34	syl2anc 586	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ≠ -∞)
36		xaddpnf1 12622	. . . . . . 7 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐶 ≠ -∞) → (𝐶 +_𝑒 +∞) = +∞)
37	25, 35, 36	syl2anc 586	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐶 +_𝑒 +∞) = +∞)
38	33, 37	breqtrrd 5096	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ (𝐶 +_𝑒 +∞))
39	31, 38	2thd 267	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
40		xnegeq 12603	. . . . . . . 8 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -_𝑒+∞)
41		xnegpnf 12605	. . . . . . . 8 ⊢ -_𝑒+∞ = -∞
42	40, 41	syl6eq 2874	. . . . . . 7 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -∞)
43	42	oveq2d 7174	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐴 +_𝑒 -_𝑒𝐵) = (𝐴 +_𝑒 -∞))
44	43	breq1d 5078	. . . . 5 ⊢ (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ (𝐴 +_𝑒 -∞) ≤ 𝐶))
45		oveq2 7166	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐶 +_𝑒 𝐵) = (𝐶 +_𝑒 +∞))
46	45	breq2d 5080	. . . . 5 ⊢ (𝐵 = +∞ → (𝐴 ≤ (𝐶 +_𝑒 𝐵) ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
47	44, 46	bibi12d 348	. . . 4 ⊢ (𝐵 = +∞ → (((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)) ↔ ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞))))
48	39, 47	syl5ibrcom 249	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵))))
49	48	imp 409	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 = +∞) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
50		simpr2 1191	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ≠ -∞)
51	2, 50	jca 514	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ^ ∧ 𝐵 ≠ -∞))
52		xrnemnf 12515	. . 3 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐵 ≠ -∞) ↔ (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
53	51, 52	sylib 220	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
54	15, 49, 53	mpjaodan 955	1 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 ∨ wo 843 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ≠ wne 3018 class class class wbr 5068 (class class class)co 7158 ℝcr 10538 0cc0 10539 +∞cpnf 10674 -∞cmnf 10675 ℝ^*cxr 10676 ≤ cle 10678 -_𝑒cxne 12507 +_𝑒 cxad 12508

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 ax-sep 5205 ax-nul 5212 ax-pow 5268 ax-pr 5332 ax-un 7463 ax-cnex 10595 ax-resscn 10596 ax-1cn 10597 ax-icn 10598 ax-addcl 10599 ax-addrcl 10600 ax-mulcl 10601 ax-mulrcl 10602 ax-mulcom 10603 ax-addass 10604 ax-mulass 10605 ax-distr 10606 ax-i2m1 10607 ax-1ne0 10608 ax-1rid 10609 ax-rnegex 10610 ax-rrecex 10611 ax-cnre 10612 ax-pre-lttri 10613 ax-pre-lttrn 10614 ax-pre-ltadd 10615

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-ne 3019 df-nel 3126 df-ral 3145 df-rex 3146 df-reu 3147 df-rab 3149 df-v 3498 df-sbc 3775 df-csb 3886 df-dif 3941 df-un 3943 df-in 3945 df-ss 3954 df-nul 4294 df-if 4470 df-pw 4543 df-sn 4570 df-pr 4572 df-op 4576 df-uni 4841 df-iun 4923 df-br 5069 df-opab 5131 df-mpt 5149 df-id 5462 df-po 5476 df-so 5477 df-xp 5563 df-rel 5564 df-cnv 5565 df-co 5566 df-dm 5567 df-rn 5568 df-res 5569 df-ima 5570 df-iota 6316 df-fun 6359 df-fn 6360 df-f 6361 df-f1 6362 df-fo 6363 df-f1o 6364 df-fv 6365 df-riota 7116 df-ov 7161 df-oprab 7162 df-mpo 7163 df-1st 7691 df-2nd 7692 df-er 8291 df-en 8512 df-dom 8513 df-sdom 8514 df-pnf 10679 df-mnf 10680 df-xr 10681 df-ltxr 10682 df-le 10683 df-sub 10874 df-neg 10875 df-xneg 12510 df-xadd 12511

This theorem is referenced by: xmetrtri 22967 metdstri 23461 metdscnlem 23465

W3C validator