Theorem xrltnr 9781

Description: The extended real 'less than' is irreflexive. (Contributed by NM, 14-Oct-2005.)

Assertion

Ref	Expression
xrltnr	⊢ (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)

Proof of Theorem xrltnr

Step	Hyp	Ref	Expression
1		elxr 9778	. 2 ⊢ (𝐴 ∈ ℝ* ↔ (𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞))
2		ltnr 8036	. . 3 ⊢ (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴)
3		pnfnre 8001	. . . . . . . . . 10 ⊢ +∞ ∉ ℝ
4	3	neli 2444	. . . . . . . . 9 ⊢ ¬ +∞ ∈ ℝ
5	4	intnan 929	. . . . . . . 8 ⊢ ¬ (+∞ ∈ ℝ ∧ +∞ ∈ ℝ)
6	5	intnanr 930	. . . . . . 7 ⊢ ¬ ((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ <ℝ +∞)
7		pnfnemnf 8014	. . . . . . . . 9 ⊢ +∞ ≠ -∞
8	7	neii 2349	. . . . . . . 8 ⊢ ¬ +∞ = -∞
9	8	intnanr 930	. . . . . . 7 ⊢ ¬ (+∞ = -∞ ∧ +∞ = +∞)
10	6, 9	pm3.2ni 813	. . . . . 6 ⊢ ¬ (((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ <ℝ +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞))
11	4	intnanr 930	. . . . . . 7 ⊢ ¬ (+∞ ∈ ℝ ∧ +∞ = +∞)
12	4	intnan 929	. . . . . . 7 ⊢ ¬ (+∞ = -∞ ∧ +∞ ∈ ℝ)
13	11, 12	pm3.2ni 813	. . . . . 6 ⊢ ¬ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))
14	10, 13	pm3.2ni 813	. . . . 5 ⊢ ¬ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ <ℝ +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))
15		pnfxr 8012	. . . . . 6 ⊢ +∞ ∈ ℝ*
16		ltxr 9777	. . . . . 6 ⊢ ((+∞ ∈ ℝ* ∧ +∞ ∈ ℝ*) → (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ <ℝ +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ)))))
17	15, 15, 16	mp2an 426	. . . . 5 ⊢ (+∞ < +∞ ↔ ((((+∞ ∈ ℝ ∧ +∞ ∈ ℝ) ∧ +∞ <ℝ +∞) ∨ (+∞ = -∞ ∧ +∞ = +∞)) ∨ ((+∞ ∈ ℝ ∧ +∞ = +∞) ∨ (+∞ = -∞ ∧ +∞ ∈ ℝ))))
18	14, 17	mtbir 671	. . . 4 ⊢ ¬ +∞ < +∞
19		breq12 4010	. . . . 5 ⊢ ((𝐴 = +∞ ∧ 𝐴 = +∞) → (𝐴 < 𝐴 ↔ +∞ < +∞))
20	19	anidms 397	. . . 4 ⊢ (𝐴 = +∞ → (𝐴 < 𝐴 ↔ +∞ < +∞))
21	18, 20	mtbiri 675	. . 3 ⊢ (𝐴 = +∞ → ¬ 𝐴 < 𝐴)
22		mnfnre 8002	. . . . . . . . . 10 ⊢ -∞ ∉ ℝ
23	22	neli 2444	. . . . . . . . 9 ⊢ ¬ -∞ ∈ ℝ
24	23	intnan 929	. . . . . . . 8 ⊢ ¬ (-∞ ∈ ℝ ∧ -∞ ∈ ℝ)
25	24	intnanr 930	. . . . . . 7 ⊢ ¬ ((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ <ℝ -∞)
26	7	nesymi 2393	. . . . . . . 8 ⊢ ¬ -∞ = +∞
27	26	intnan 929	. . . . . . 7 ⊢ ¬ (-∞ = -∞ ∧ -∞ = +∞)
28	25, 27	pm3.2ni 813	. . . . . 6 ⊢ ¬ (((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ <ℝ -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞))
29	23	intnanr 930	. . . . . . 7 ⊢ ¬ (-∞ ∈ ℝ ∧ -∞ = +∞)
30	23	intnan 929	. . . . . . 7 ⊢ ¬ (-∞ = -∞ ∧ -∞ ∈ ℝ)
31	29, 30	pm3.2ni 813	. . . . . 6 ⊢ ¬ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))
32	28, 31	pm3.2ni 813	. . . . 5 ⊢ ¬ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ <ℝ -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))
33		mnfxr 8016	. . . . . 6 ⊢ -∞ ∈ ℝ*
34		ltxr 9777	. . . . . 6 ⊢ ((-∞ ∈ ℝ* ∧ -∞ ∈ ℝ*) → (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ <ℝ -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ)))))
35	33, 33, 34	mp2an 426	. . . . 5 ⊢ (-∞ < -∞ ↔ ((((-∞ ∈ ℝ ∧ -∞ ∈ ℝ) ∧ -∞ <ℝ -∞) ∨ (-∞ = -∞ ∧ -∞ = +∞)) ∨ ((-∞ ∈ ℝ ∧ -∞ = +∞) ∨ (-∞ = -∞ ∧ -∞ ∈ ℝ))))
36	32, 35	mtbir 671	. . . 4 ⊢ ¬ -∞ < -∞
37		breq12 4010	. . . . 5 ⊢ ((𝐴 = -∞ ∧ 𝐴 = -∞) → (𝐴 < 𝐴 ↔ -∞ < -∞))
38	37	anidms 397	. . . 4 ⊢ (𝐴 = -∞ → (𝐴 < 𝐴 ↔ -∞ < -∞))
39	36, 38	mtbiri 675	. . 3 ⊢ (𝐴 = -∞ → ¬ 𝐴 < 𝐴)
40	2, 21, 39	3jaoi 1303	. 2 ⊢ ((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) → ¬ 𝐴 < 𝐴)
41	1, 40	sylbi 121	1 ⊢ (𝐴 ∈ ℝ* → ¬ 𝐴 < 𝐴)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 104   ↔ wb 105   ∨ wo 708   ∨ w3o 977   = wceq 1353   ∈ wcel 2148   class class class wbr 4005  ℝcr 7812   <_ℝ cltrr 7817  +∞cpnf 7991  -∞cmnf 7992  ℝ^*cxr 7993   < clt 7994

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 614  ax-in2 615  ax-io 709  ax-5 1447  ax-7 1448  ax-gen 1449  ax-ie1 1493  ax-ie2 1494  ax-8 1504  ax-10 1505  ax-11 1506  ax-i12 1507  ax-bndl 1509  ax-4 1510  ax-17 1526  ax-i9 1530  ax-ial 1534  ax-i5r 1535  ax-13 2150  ax-14 2151  ax-ext 2159  ax-sep 4123  ax-pow 4176  ax-pr 4211  ax-un 4435  ax-setind 4538  ax-cnex 7904  ax-resscn 7905  ax-pre-ltirr 7925

This theorem depends on definitions:  df-bi 117  df-3or 979  df-3an 980  df-tru 1356  df-fal 1359  df-nf 1461  df-sb 1763  df-eu 2029  df-mo 2030  df-clab 2164  df-cleq 2170  df-clel 2173  df-nfc 2308  df-ne 2348  df-nel 2443  df-ral 2460  df-rex 2461  df-rab 2464  df-v 2741  df-dif 3133  df-un 3135  df-in 3137  df-ss 3144  df-pw 3579  df-sn 3600  df-pr 3601  df-op 3603  df-uni 3812  df-br 4006  df-opab 4067  df-xp 4634  df-pnf 7996  df-mnf 7997  df-xr 7998  df-ltxr 7999

This theorem is referenced by:  xrltnsym  9795  xrltso  9798  xrlttri3  9799  xrleid  9802  xrltne  9815  nltpnft  9816  ngtmnft  9819  xrrebnd  9821  xposdif  9884  lbioog  9915  ubioog  9916  xrmaxleim  11254  xrmaxiflemlub  11258