xlesubadd - Metamath Proof Explorer

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Theorem xlesubadd 13243

Description: Under certain conditions, the conclusion of lesubadd 11685 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 1188	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ∈ ℝ^)
2		simpl2 1189	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐵 ∈ ℝ^)
3		xnegcl 13193	. . . . . . 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 13219	. . . . . 6 ⊢ ((𝐴 ∈ ℝ^* ∧ -_𝑒𝐵 ∈ ℝ^) → (𝐴 +_𝑒 -_𝑒𝐵) ∈ ℝ^)
6	1, 4, 5	syl2anc 583	. . . . 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 1211	. . . 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 13235	. . . 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 1368	. . 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 13232	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
13	1, 12	sylan 579	. . . 4 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 ∈ ℝ) → ((𝐴 +_𝑒 -_𝑒𝐵) +_𝑒 𝐵) = 𝐴)
14	13	breq1d 5149	. . 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 1193	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 0 ≤ 𝐶)
17		oveq1 7409	. . . . . . . . 9 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = (+∞ +_𝑒 -∞))
18		pnfaddmnf 13210	. . . . . . . . 9 ⊢ (+∞ +_𝑒 -∞) = 0
19	17, 18	eqtrdi 2780	. . . . . . . 8 ⊢ (𝐴 = +∞ → (𝐴 +_𝑒 -∞) = 0)
20	19	breq1d 5149	. . . . . . 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 13208	. . . . . . . . 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 1190	. . . . . . . . 9 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ∈ ℝ^)
26		mnfle 13115	. . . . . . . . 9 ⊢ (𝐶 ∈ ℝ^* → -∞ ≤ 𝐶)
27	25, 26	syl 17	. . . . . . . 8 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → -∞ ≤ 𝐶)
28		breq1 5142	. . . . . . . 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 3020	. . . . 5 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐴 +_𝑒 -∞) ≤ 𝐶)
32		pnfge 13111	. . . . . . 7 ⊢ (𝐴 ∈ ℝ^* → 𝐴 ≤ +∞)
33	1, 32	syl 17	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐴 ≤ +∞)
34		ge0nemnf 13153	. . . . . . . 8 ⊢ ((𝐶 ∈ ℝ^* ∧ 0 ≤ 𝐶) → 𝐶 ≠ -∞)
35	25, 16, 34	syl2anc 583	. . . . . . 7 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → 𝐶 ≠ -∞)
36		xaddpnf1 13206	. . . . . . 7 ⊢ ((𝐶 ∈ ℝ^* ∧ 𝐶 ≠ -∞) → (𝐶 +_𝑒 +∞) = +∞)
37	25, 35, 36	syl2anc 583	. . . . . 6 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) → (𝐶 +_𝑒 +∞) = +∞)
38	33, 37	breqtrrd 5167	. . . . 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 13187	. . . . . . . 8 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -_𝑒+∞)
41		xnegpnf 13189	. . . . . . . 8 ⊢ -_𝑒+∞ = -∞
42	40, 41	eqtrdi 2780	. . . . . . 7 ⊢ (𝐵 = +∞ → -_𝑒𝐵 = -∞)
43	42	oveq2d 7418	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐴 +_𝑒 -_𝑒𝐵) = (𝐴 +_𝑒 -∞))
44	43	breq1d 5149	. . . . 5 ⊢ (𝐵 = +∞ → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ (𝐴 +_𝑒 -∞) ≤ 𝐶))
45		oveq2 7410	. . . . . 6 ⊢ (𝐵 = +∞ → (𝐶 +_𝑒 𝐵) = (𝐶 +_𝑒 +∞))
46	45	breq2d 5151	. . . . 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 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 406	. 2 ⊢ ((((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 𝐵 ≠ -∞ ∧ 0 ≤ 𝐶)) ∧ 𝐵 = +∞) → ((𝐴 +_𝑒 -_𝑒𝐵) ≤ 𝐶 ↔ 𝐴 ≤ (𝐶 +_𝑒 𝐵)))
50		simpr2 1192	. . . 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 13098	. . 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 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 205 ∧ wa 395 ∨ wo 844 ∧ w3a 1084 = wceq 1533 ∈ wcel 2098 ≠ wne 2932 class class class wbr 5139 (class class class)co 7402 ℝcr 11106 0cc0 11107 +∞cpnf 11244 -∞cmnf 11245 ℝ^*cxr 11246 ≤ cle 11248 -_𝑒cxne 13090 +_𝑒 cxad 13091

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2695 ax-sep 5290 ax-nul 5297 ax-pow 5354 ax-pr 5418 ax-un 7719 ax-cnex 11163 ax-resscn 11164 ax-1cn 11165 ax-icn 11166 ax-addcl 11167 ax-addrcl 11168 ax-mulcl 11169 ax-mulrcl 11170 ax-mulcom 11171 ax-addass 11172 ax-mulass 11173 ax-distr 11174 ax-i2m1 11175 ax-1ne0 11176 ax-1rid 11177 ax-rnegex 11178 ax-rrecex 11179 ax-cnre 11180 ax-pre-lttri 11181 ax-pre-lttrn 11182 ax-pre-ltadd 11183

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2526 df-eu 2555 df-clab 2702 df-cleq 2716 df-clel 2802 df-nfc 2877 df-ne 2933 df-nel 3039 df-ral 3054 df-rex 3063 df-reu 3369 df-rab 3425 df-v 3468 df-sbc 3771 df-csb 3887 df-dif 3944 df-un 3946 df-in 3948 df-ss 3958 df-nul 4316 df-if 4522 df-pw 4597 df-sn 4622 df-pr 4624 df-op 4628 df-uni 4901 df-iun 4990 df-br 5140 df-opab 5202 df-mpt 5223 df-id 5565 df-po 5579 df-so 5580 df-xp 5673 df-rel 5674 df-cnv 5675 df-co 5676 df-dm 5677 df-rn 5678 df-res 5679 df-ima 5680 df-iota 6486 df-fun 6536 df-fn 6537 df-f 6538 df-f1 6539 df-fo 6540 df-f1o 6541 df-fv 6542 df-riota 7358 df-ov 7405 df-oprab 7406 df-mpo 7407 df-1st 7969 df-2nd 7970 df-er 8700 df-en 8937 df-dom 8938 df-sdom 8939 df-pnf 11249 df-mnf 11250 df-xr 11251 df-ltxr 11252 df-le 11253 df-sub 11445 df-neg 11446 df-xneg 13093 df-xadd 13094

This theorem is referenced by: xmetrtri 24205 metdstri 24711 metdscnlem 24715

W3C validator