xlesubadd - Metamath Proof Explorer

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Theorem xlesubadd 13162

Description: Under certain conditions, the conclusion of lesubadd 11589 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 1192	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ∈ ℝ^)
2		simpl2 1193	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ∈ ℝ^)
3		xnegcl 13112	. . . . . . 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 13138	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ -_𝑒𝐵 ∈ ℝ^) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
6	1, 4, 5	syl2anc 584	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
7	6	adantr 480	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
8		simpll3 1215	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐶 ∈ ℝ^)
9		simpr 484	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
10		xleadd1 13154	. . . 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 1373	. . 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 13151	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
13	1, 12	sylan 580	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
14	13	breq1d 5099	. . 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 279	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
16		simpr3 1197	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 0 ≤ 𝐶)
17		oveq1 7353	. . . . . . . . 9 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = (+∞ +_𝑒 -∞))
18		pnfaddmnf 13129	. . . . . . . . 9 ⊢ (+∞ +_𝑒 -∞) = 0
19	17, 18	eqtrdi 2782	. . . . . . . 8 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = 0)
20	19	breq1d 5099	. . . . . . 7 ⊢ (𝐴 = +∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 0 ≤ 𝐶))
21	16, 20	syl5ibrcom 247	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 = +∞ → (𝐴 +_𝑒 -∞) ≤ 𝐶))
22		xaddmnf1 13127	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≠ +∞) → (𝐴 +_𝑒 -∞) = -∞)
23	22	ex 412	. . . . . . . 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 1194	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ∈ ℝ^)
26		mnfle 13034	. . . . . . . . 9 ⊢ (𝐶 ∈ ℝ^* → -∞ ≤ 𝐶)
27	25, 26	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → -∞ ≤ 𝐶)
28		breq1 5092	. . . . . . . 8 ⊢ ((𝐴 +_𝑒 -∞) = -∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ -∞ ≤ 𝐶))
29	27, 28	syl5ibrcom 247	. . . . . . 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 3014	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -∞) ≤ 𝐶)
32		pnfge 13029	. . . . . . 7 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ≤ +∞)
33	1, 32	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ +∞)
34		ge0nemnf 13072	. . . . . . . 8 ⊢ ((𝐶 ∈ ℝ^* ∧ 0 ≤ 𝐶) → 𝐶 ≠ -∞)
35	25, 16, 34	syl2anc 584	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ≠ -∞)
36		xaddpnf1 13125	. . . . . . 7 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐶 ≠ -∞) → (𝐶 +_𝑒 +∞) = +∞)
37	25, 35, 36	syl2anc 584	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐶 +_𝑒 +∞) = +∞)
38	33, 37	breqtrrd 5117	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ (𝐶 +_𝑒 +∞))
39	31, 38	2thd 265	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
40		xnegeq 13106	. . . . . . . 8 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -_𝑒+∞)
41		xnegpnf 13108	. . . . . . . 8 ⊢ -_𝑒+∞ = -∞
42	40, 41	eqtrdi 2782	. . . . . . 7 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -∞)
43	42	oveq2d 7362	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐴 +_𝑒 -_𝑒𝐵) = (𝐴 +_𝑒 -∞))
44	43	breq1d 5099	. . . . 5 ⊢ (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ (𝐴 +_𝑒 -∞) ≤ 𝐶))
45		oveq2 7354	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐶 +_𝑒 𝐵) = (𝐶 +_𝑒 +∞))
46	45	breq2d 5101	. . . . 5 ⊢ (𝐵 = +∞ → (𝐴 ≤ (𝐶 +_𝑒 𝐵) ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
47	44, 46	bibi12d 345	. . . 4 ⊢ (𝐵 = +∞ → (((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)) ↔ ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞))))
48	39, 47	syl5ibrcom 247	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵))))
49	48	imp 406	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 = +∞) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
50		simpr2 1196	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ≠ -∞)
51	2, 50	jca 511	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ^ ∧ 𝐵 ≠ -∞))
52		xrnemnf 13016	. . 3 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐵 ≠ -∞) ↔ (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
53	51, 52	sylib 218	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
54	15, 49, 53	mpjaodan 960	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 206 ∧ wa 395 ∨ wo 847 ∧ w3a 1086 = wceq 1541 ∈ wcel 2111 ≠ wne 2928 class class class wbr 5089 (class class class)co 7346 ℝcr 11005 0cc0 11006 +∞cpnf 11143 -∞cmnf 11144 ℝ^*cxr 11145 ≤ cle 11147 -_𝑒cxne 13008 +_𝑒 cxad 13009

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 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-cnex 11062 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4941 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-po 5522 df-so 5523 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-1st 7921 df-2nd 7922 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-xr 11150 df-ltxr 11151 df-le 11152 df-sub 11346 df-neg 11347 df-xneg 13011 df-xadd 13012

This theorem is referenced by: xmetrtri 24270 metdstri 24767 metdscnlem 24771

W3C validator