xlesubadd - Metamath Proof Explorer

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Theorem xlesubadd 12997

Description: Under certain conditions, the conclusion of lesubadd 11447 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 1190	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ∈ ℝ^)
2		simpl2 1191	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ∈ ℝ^)
3		xnegcl 12947	. . . . . . 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 12973	. . . . . 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 481	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
8		simpll3 1213	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐶 ∈ ℝ^)
9		simpr 485	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → 𝐵 ∈ ℝ)
10		xleadd1 12989	. . . 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 1370	. . 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 12986	. . . . 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 5084	. . 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 278	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
16		simpr3 1195	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 0 ≤ 𝐶)
17		oveq1 7282	. . . . . . . . 9 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = (+∞ +_𝑒 -∞))
18		pnfaddmnf 12964	. . . . . . . . 9 ⊢ (+∞ +_𝑒 -∞) = 0
19	17, 18	eqtrdi 2794	. . . . . . . 8 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = 0)
20	19	breq1d 5084	. . . . . . 7 ⊢ (𝐴 = +∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 0 ≤ 𝐶))
21	16, 20	syl5ibrcom 246	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 = +∞ → (𝐴 +_𝑒 -∞) ≤ 𝐶))
22		xaddmnf1 12962	. . . . . . . . 9 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐴 ≠ +∞) → (𝐴 +_𝑒 -∞) = -∞)
23	22	ex 413	. . . . . . . 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 1192	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ∈ ℝ^)
26		mnfle 12870	. . . . . . . . 9 ⊢ (𝐶 ∈ ℝ^* → -∞ ≤ 𝐶)
27	25, 26	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → -∞ ≤ 𝐶)
28		breq1 5077	. . . . . . . 8 ⊢ ((𝐴 +_𝑒 -∞) = -∞ → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ -∞ ≤ 𝐶))
29	27, 28	syl5ibrcom 246	. . . . . . 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 3031	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -∞) ≤ 𝐶)
32		pnfge 12866	. . . . . . 7 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ≤ +∞)
33	1, 32	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ +∞)
34		ge0nemnf 12907	. . . . . . . 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 12960	. . . . . . 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 5102	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ (𝐶 +_𝑒 +∞))
39	31, 38	2thd 264	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
40		xnegeq 12941	. . . . . . . 8 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -_𝑒+∞)
41		xnegpnf 12943	. . . . . . . 8 ⊢ -_𝑒+∞ = -∞
42	40, 41	eqtrdi 2794	. . . . . . 7 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -∞)
43	42	oveq2d 7291	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐴 +_𝑒 -_𝑒𝐵) = (𝐴 +_𝑒 -∞))
44	43	breq1d 5084	. . . . 5 ⊢ (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ (𝐴 +_𝑒 -∞) ≤ 𝐶))
45		oveq2 7283	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐶 +_𝑒 𝐵) = (𝐶 +_𝑒 +∞))
46	45	breq2d 5086	. . . . 5 ⊢ (𝐵 = +∞ → (𝐴 ≤ (𝐶 +_𝑒 𝐵) ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞)))
47	44, 46	bibi12d 346	. . . 4 ⊢ (𝐵 = +∞ → (((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)) ↔ ((𝐴 +_𝑒 -∞) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 +∞))))
48	39, 47	syl5ibrcom 246	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵))))
49	48	imp 407	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 = +∞) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
50		simpr2 1194	. . . 4 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ≠ -∞)
51	2, 50	jca 512	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ^ ∧ 𝐵 ≠ -∞))
52		xrnemnf 12853	. . 3 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐵 ≠ -∞) ↔ (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
53	51, 52	sylib 217	. 2 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐵 ∈ ℝ ∨ 𝐵 = +∞))
54	15, 49, 53	mpjaodan 956	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 205 ∧ wa 396 ∨ wo 844 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ≠ wne 2943 class class class wbr 5074 (class class class)co 7275 ℝcr 10870 0cc0 10871 +∞cpnf 11006 -∞cmnf 11007 ℝ^*cxr 11008 ≤ cle 11010 -_𝑒cxne 12845 +_𝑒 cxad 12846

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 ax-cnex 10927 ax-resscn 10928 ax-1cn 10929 ax-icn 10930 ax-addcl 10931 ax-addrcl 10932 ax-mulcl 10933 ax-mulrcl 10934 ax-mulcom 10935 ax-addass 10936 ax-mulass 10937 ax-distr 10938 ax-i2m1 10939 ax-1ne0 10940 ax-1rid 10941 ax-rnegex 10942 ax-rrecex 10943 ax-cnre 10944 ax-pre-lttri 10945 ax-pre-lttrn 10946 ax-pre-ltadd 10947

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ne 2944 df-nel 3050 df-ral 3069 df-rex 3070 df-reu 3072 df-rab 3073 df-v 3434 df-sbc 3717 df-csb 3833 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-iun 4926 df-br 5075 df-opab 5137 df-mpt 5158 df-id 5489 df-po 5503 df-so 5504 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-rn 5600 df-res 5601 df-ima 5602 df-iota 6391 df-fun 6435 df-fn 6436 df-f 6437 df-f1 6438 df-fo 6439 df-f1o 6440 df-fv 6441 df-riota 7232 df-ov 7278 df-oprab 7279 df-mpo 7280 df-1st 7831 df-2nd 7832 df-er 8498 df-en 8734 df-dom 8735 df-sdom 8736 df-pnf 11011 df-mnf 11012 df-xr 11013 df-ltxr 11014 df-le 11015 df-sub 11207 df-neg 11208 df-xneg 12848 df-xadd 12849

This theorem is referenced by: xmetrtri 23508 metdstri 24014 metdscnlem 24018

W3C validator