zabsle1 - Intuitionistic Logic Explorer

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Theorem zabsle1 15727

Description: {-1, 0, 1} is the set of all integers with absolute value at most 1. (Contributed by AV, 13-Jul-2021.)

**Assertion**
Ref	Expression
zabsle1	⊢ (𝑍 ∈ ℤ → (𝑍 ∈ {-1, 0, 1} ↔ (abs‘𝑍) ≤ 1))

**Proof of Theorem zabsle1**
Step	Hyp	Ref	Expression
1		eltpi 3716	. . 3 ⊢ (𝑍 ∈ {-1, 0, 1} → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
2		fveq2 5639	. . . . 5 ⊢ (𝑍 = -1 → (abs‘𝑍) = (abs‘-1))
3		ax-1cn 8124	. . . . . . . 8 ⊢ 1 ∈ ℂ
4	3	absnegi 11707	. . . . . . 7 ⊢ (abs‘-1) = (abs‘1)
5		abs1 11632	. . . . . . 7 ⊢ (abs‘1) = 1
6	4, 5	eqtri 2252	. . . . . 6 ⊢ (abs‘-1) = 1
7		1le1 8751	. . . . . 6 ⊢ 1 ≤ 1
8	6, 7	eqbrtri 4109	. . . . 5 ⊢ (abs‘-1) ≤ 1
9	2, 8	eqbrtrdi 4127	. . . 4 ⊢ (𝑍 = -1 → (abs‘𝑍) ≤ 1)
10		fveq2 5639	. . . . 5 ⊢ (𝑍 = 0 → (abs‘𝑍) = (abs‘0))
11		abs0 11618	. . . . . 6 ⊢ (abs‘0) = 0
12		0le1 8660	. . . . . 6 ⊢ 0 ≤ 1
13	11, 12	eqbrtri 4109	. . . . 5 ⊢ (abs‘0) ≤ 1
14	10, 13	eqbrtrdi 4127	. . . 4 ⊢ (𝑍 = 0 → (abs‘𝑍) ≤ 1)
15		fveq2 5639	. . . . 5 ⊢ (𝑍 = 1 → (abs‘𝑍) = (abs‘1))
16	5, 7	eqbrtri 4109	. . . . 5 ⊢ (abs‘1) ≤ 1
17	15, 16	eqbrtrdi 4127	. . . 4 ⊢ (𝑍 = 1 → (abs‘𝑍) ≤ 1)
18	9, 14, 17	3jaoi 1339	. . 3 ⊢ ((𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1) → (abs‘𝑍) ≤ 1)
19	1, 18	syl 14	. 2 ⊢ (𝑍 ∈ {-1, 0, 1} → (abs‘𝑍) ≤ 1)
20		zre 9482	. . . 4 ⊢ (𝑍 ∈ ℤ → 𝑍 ∈ ℝ)
21		1red 8193	. . . 4 ⊢ (𝑍 ∈ ℤ → 1 ∈ ℝ)
22	20, 21	absled 11735	. . 3 ⊢ (𝑍 ∈ ℤ → ((abs‘𝑍) ≤ 1 ↔ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)))
23		elz 9480	. . . 4 ⊢ (𝑍 ∈ ℤ ↔ (𝑍 ∈ ℝ ∧ (𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ)))
24		3mix2 1193	. . . . . . . . . 10 ⊢ (𝑍 = 0 → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
25	24	a1d 22	. . . . . . . . 9 ⊢ (𝑍 = 0 → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
26		nnle1eq1 9166	. . . . . . . . . . . . . . 15 ⊢ (𝑍 ∈ ℕ → (𝑍 ≤ 1 ↔ 𝑍 = 1))
27	26	biimpac 298	. . . . . . . . . . . . . 14 ⊢ ((𝑍 ≤ 1 ∧ 𝑍 ∈ ℕ) → 𝑍 = 1)
28	27	3mix3d 1200	. . . . . . . . . . . . 13 ⊢ ((𝑍 ≤ 1 ∧ 𝑍 ∈ ℕ) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
29	28	ex 115	. . . . . . . . . . . 12 ⊢ (𝑍 ≤ 1 → (𝑍 ∈ ℕ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
30	29	adantl 277	. . . . . . . . . . 11 ⊢ ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → (𝑍 ∈ ℕ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
31	30	adantl 277	. . . . . . . . . 10 ⊢ ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 ∈ ℕ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
32	31	com12 30	. . . . . . . . 9 ⊢ (𝑍 ∈ ℕ → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
33		elnnz1 9501	. . . . . . . . . 10 ⊢ (-𝑍 ∈ ℕ ↔ (-𝑍 ∈ ℤ ∧ 1 ≤ -𝑍))
34		1red 8193	. . . . . . . . . . . . . . 15 ⊢ (𝑍 ∈ ℝ → 1 ∈ ℝ)
35		lenegcon2 8646	. . . . . . . . . . . . . . 15 ⊢ ((1 ∈ ℝ ∧ 𝑍 ∈ ℝ) → (1 ≤ -𝑍 ↔ 𝑍 ≤ -1))
36	34, 35	mpancom 422	. . . . . . . . . . . . . 14 ⊢ (𝑍 ∈ ℝ → (1 ≤ -𝑍 ↔ 𝑍 ≤ -1))
37		neg1rr 9248	. . . . . . . . . . . . . . . . . . . . 21 ⊢ -1 ∈ ℝ
38	37	a1i 9	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 ∈ ℝ → -1 ∈ ℝ)
39		id 19	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 ∈ ℝ → 𝑍 ∈ ℝ)
40	38, 39	letri3d 8294	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑍 ∈ ℝ → (-1 = 𝑍 ↔ (-1 ≤ 𝑍 ∧ 𝑍 ≤ -1)))
41		3mix1 1192	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 = -1 → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
42	41	eqcoms 2234	. . . . . . . . . . . . . . . . . . 19 ⊢ (-1 = 𝑍 → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
43	40, 42	biimtrrdi 164	. . . . . . . . . . . . . . . . . 18 ⊢ (𝑍 ∈ ℝ → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ -1) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
44	43	com12 30	. . . . . . . . . . . . . . . . 17 ⊢ ((-1 ≤ 𝑍 ∧ 𝑍 ≤ -1) → (𝑍 ∈ ℝ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
45	44	ex 115	. . . . . . . . . . . . . . . 16 ⊢ (-1 ≤ 𝑍 → (𝑍 ≤ -1 → (𝑍 ∈ ℝ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))))
46	45	adantr 276	. . . . . . . . . . . . . . 15 ⊢ ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → (𝑍 ≤ -1 → (𝑍 ∈ ℝ → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))))
47	46	com13 80	. . . . . . . . . . . . . 14 ⊢ (𝑍 ∈ ℝ → (𝑍 ≤ -1 → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))))
48	36, 47	sylbid 150	. . . . . . . . . . . . 13 ⊢ (𝑍 ∈ ℝ → (1 ≤ -𝑍 → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))))
49	48	com12 30	. . . . . . . . . . . 12 ⊢ (1 ≤ -𝑍 → (𝑍 ∈ ℝ → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))))
50	49	impd 254	. . . . . . . . . . 11 ⊢ (1 ≤ -𝑍 → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
51	50	adantl 277	. . . . . . . . . 10 ⊢ ((-𝑍 ∈ ℤ ∧ 1 ≤ -𝑍) → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
52	33, 51	sylbi 121	. . . . . . . . 9 ⊢ (-𝑍 ∈ ℕ → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
53	25, 32, 52	3jaoi 1339	. . . . . . . 8 ⊢ ((𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ) → ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
54	53	imp 124	. . . . . . 7 ⊢ (((𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ) ∧ (𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1))) → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
55		eltpg 3714	. . . . . . . . 9 ⊢ (𝑍 ∈ ℝ → (𝑍 ∈ {-1, 0, 1} ↔ (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
56	55	adantr 276	. . . . . . . 8 ⊢ ((𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)) → (𝑍 ∈ {-1, 0, 1} ↔ (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
57	56	adantl 277	. . . . . . 7 ⊢ (((𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ) ∧ (𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1))) → (𝑍 ∈ {-1, 0, 1} ↔ (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1)))
58	54, 57	mpbird 167	. . . . . 6 ⊢ (((𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ) ∧ (𝑍 ∈ ℝ ∧ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1))) → 𝑍 ∈ {-1, 0, 1})
59	58	exp32 365	. . . . 5 ⊢ ((𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ) → (𝑍 ∈ ℝ → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → 𝑍 ∈ {-1, 0, 1})))
60	59	impcom 125	. . . 4 ⊢ ((𝑍 ∈ ℝ ∧ (𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ)) → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → 𝑍 ∈ {-1, 0, 1}))
61	23, 60	sylbi 121	. . 3 ⊢ (𝑍 ∈ ℤ → ((-1 ≤ 𝑍 ∧ 𝑍 ≤ 1) → 𝑍 ∈ {-1, 0, 1}))
62	22, 61	sylbid 150	. 2 ⊢ (𝑍 ∈ ℤ → ((abs‘𝑍) ≤ 1 → 𝑍 ∈ {-1, 0, 1}))
63	19, 62	impbid2 143	1 ⊢ (𝑍 ∈ ℤ → (𝑍 ∈ {-1, 0, 1} ↔ (abs‘𝑍) ≤ 1))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∨ w3o 1003 = wceq 1397 ∈ wcel 2202 {ctp 3671 class class class wbr 4088 ‘cfv 5326 ℝcr 8030 0cc0 8031 1c1 8032 ≤ cle 8214 -cneg 8350 ℕcn 9142 ℤcz 9478 abscabs 11557

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 619 ax-in2 620 ax-io 716 ax-5 1495 ax-7 1496 ax-gen 1497 ax-ie1 1541 ax-ie2 1542 ax-8 1552 ax-10 1553 ax-11 1554 ax-i12 1555 ax-bndl 1557 ax-4 1558 ax-17 1574 ax-i9 1578 ax-ial 1582 ax-i5r 1583 ax-13 2204 ax-14 2205 ax-ext 2213 ax-coll 4204 ax-sep 4207 ax-nul 4215 ax-pow 4264 ax-pr 4299 ax-un 4530 ax-setind 4635 ax-iinf 4686 ax-cnex 8122 ax-resscn 8123 ax-1cn 8124 ax-1re 8125 ax-icn 8126 ax-addcl 8127 ax-addrcl 8128 ax-mulcl 8129 ax-mulrcl 8130 ax-addcom 8131 ax-mulcom 8132 ax-addass 8133 ax-mulass 8134 ax-distr 8135 ax-i2m1 8136 ax-0lt1 8137 ax-1rid 8138 ax-0id 8139 ax-rnegex 8140 ax-precex 8141 ax-cnre 8142 ax-pre-ltirr 8143 ax-pre-ltwlin 8144 ax-pre-lttrn 8145 ax-pre-apti 8146 ax-pre-ltadd 8147 ax-pre-mulgt0 8148 ax-pre-mulext 8149 ax-arch 8150 ax-caucvg 8151

This theorem depends on definitions: df-bi 117 df-dc 842 df-3or 1005 df-3an 1006 df-tru 1400 df-fal 1403 df-nf 1509 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2363 df-ne 2403 df-nel 2498 df-ral 2515 df-rex 2516 df-reu 2517 df-rmo 2518 df-rab 2519 df-v 2804 df-sbc 3032 df-csb 3128 df-dif 3202 df-un 3204 df-in 3206 df-ss 3213 df-nul 3495 df-if 3606 df-pw 3654 df-sn 3675 df-pr 3676 df-tp 3677 df-op 3678 df-uni 3894 df-int 3929 df-iun 3972 df-br 4089 df-opab 4151 df-mpt 4152 df-tr 4188 df-id 4390 df-po 4393 df-iso 4394 df-iord 4463 df-on 4465 df-ilim 4466 df-suc 4468 df-iom 4689 df-xp 4731 df-rel 4732 df-cnv 4733 df-co 4734 df-dm 4735 df-rn 4736 df-res 4737 df-ima 4738 df-iota 5286 df-fun 5328 df-fn 5329 df-f 5330 df-f1 5331 df-fo 5332 df-f1o 5333 df-fv 5334 df-riota 5970 df-ov 6020 df-oprab 6021 df-mpo 6022 df-1st 6302 df-2nd 6303 df-recs 6470 df-frec 6556 df-pnf 8215 df-mnf 8216 df-xr 8217 df-ltxr 8218 df-le 8219 df-sub 8351 df-neg 8352 df-reap 8754 df-ap 8761 df-div 8852 df-inn 9143 df-2 9201 df-3 9202 df-4 9203 df-n0 9402 df-z 9479 df-uz 9755 df-rp 9888 df-seqfrec 10709 df-exp 10800 df-cj 11402 df-re 11403 df-im 11404 df-rsqrt 11558 df-abs 11559

This theorem is referenced by: lgscl1 15751

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