zabsle1 - Intuitionistic Logic Explorer

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Theorem zabsle1 14878

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 3654	. . 3 ⊢ (𝑍 ∈ {-1, 0, 1} → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
2		fveq2 5534	. . . . 5 ⊢ (𝑍 = -1 → (abs‘𝑍) = (abs‘-1))
3		ax-1cn 7935	. . . . . . . 8 ⊢ 1 ∈ ℂ
4	3	absnegi 11191	. . . . . . 7 ⊢ (abs‘-1) = (abs‘1)
5		abs1 11116	. . . . . . 7 ⊢ (abs‘1) = 1
6	4, 5	eqtri 2210	. . . . . 6 ⊢ (abs‘-1) = 1
7		1le1 8560	. . . . . 6 ⊢ 1 ≤ 1
8	6, 7	eqbrtri 4039	. . . . 5 ⊢ (abs‘-1) ≤ 1
9	2, 8	eqbrtrdi 4057	. . . 4 ⊢ (𝑍 = -1 → (abs‘𝑍) ≤ 1)
10		fveq2 5534	. . . . 5 ⊢ (𝑍 = 0 → (abs‘𝑍) = (abs‘0))
11		abs0 11102	. . . . . 6 ⊢ (abs‘0) = 0
12		0le1 8469	. . . . . 6 ⊢ 0 ≤ 1
13	11, 12	eqbrtri 4039	. . . . 5 ⊢ (abs‘0) ≤ 1
14	10, 13	eqbrtrdi 4057	. . . 4 ⊢ (𝑍 = 0 → (abs‘𝑍) ≤ 1)
15		fveq2 5534	. . . . 5 ⊢ (𝑍 = 1 → (abs‘𝑍) = (abs‘1))
16	5, 7	eqbrtri 4039	. . . . 5 ⊢ (abs‘1) ≤ 1
17	15, 16	eqbrtrdi 4057	. . . 4 ⊢ (𝑍 = 1 → (abs‘𝑍) ≤ 1)
18	9, 14, 17	3jaoi 1314	. . 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 9288	. . . 4 ⊢ (𝑍 ∈ ℤ → 𝑍 ∈ ℝ)
21		1red 8003	. . . 4 ⊢ (𝑍 ∈ ℤ → 1 ∈ ℝ)
22	20, 21	absled 11219	. . 3 ⊢ (𝑍 ∈ ℤ → ((abs‘𝑍) ≤ 1 ↔ (-1 ≤ 𝑍 ∧ 𝑍 ≤ 1)))
23		elz 9286	. . . 4 ⊢ (𝑍 ∈ ℤ ↔ (𝑍 ∈ ℝ ∧ (𝑍 = 0 ∨ 𝑍 ∈ ℕ ∨ -𝑍 ∈ ℕ)))
24		3mix2 1169	. . . . . . . . . 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 8974	. . . . . . . . . . . . . . 15 ⊢ (𝑍 ∈ ℕ → (𝑍 ≤ 1 ↔ 𝑍 = 1))
27	26	biimpac 298	. . . . . . . . . . . . . 14 ⊢ ((𝑍 ≤ 1 ∧ 𝑍 ∈ ℕ) → 𝑍 = 1)
28	27	3mix3d 1176	. . . . . . . . . . . . 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 9307	. . . . . . . . . 10 ⊢ (-𝑍 ∈ ℕ ↔ (-𝑍 ∈ ℤ ∧ 1 ≤ -𝑍))
34		1red 8003	. . . . . . . . . . . . . . 15 ⊢ (𝑍 ∈ ℝ → 1 ∈ ℝ)
35		lenegcon2 8455	. . . . . . . . . . . . . . 15 ⊢ ((1 ∈ ℝ ∧ 𝑍 ∈ ℝ) → (1 ≤ -𝑍 ↔ 𝑍 ≤ -1))
36	34, 35	mpancom 422	. . . . . . . . . . . . . 14 ⊢ (𝑍 ∈ ℝ → (1 ≤ -𝑍 ↔ 𝑍 ≤ -1))
37		neg1rr 9056	. . . . . . . . . . . . . . . . . . . . 21 ⊢ -1 ∈ ℝ
38	37	a1i 9	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 ∈ ℝ → -1 ∈ ℝ)
39		id 19	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 ∈ ℝ → 𝑍 ∈ ℝ)
40	38, 39	letri3d 8104	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑍 ∈ ℝ → (-1 = 𝑍 ↔ (-1 ≤ 𝑍 ∧ 𝑍 ≤ -1)))
41		3mix1 1168	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑍 = -1 → (𝑍 = -1 ∨ 𝑍 = 0 ∨ 𝑍 = 1))
42	41	eqcoms 2192	. . . . . . . . . . . . . . . . . . 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 1314	. . . . . . . 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 3652	. . . . . . . . 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 979 = wceq 1364 ∈ wcel 2160 {ctp 3609 class class class wbr 4018 ‘cfv 5235 ℝcr 7841 0cc0 7842 1c1 7843 ≤ cle 8024 -cneg 8160 ℕcn 8950 ℤcz 9284 abscabs 11041

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 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2162 ax-14 2163 ax-ext 2171 ax-coll 4133 ax-sep 4136 ax-nul 4144 ax-pow 4192 ax-pr 4227 ax-un 4451 ax-setind 4554 ax-iinf 4605 ax-cnex 7933 ax-resscn 7934 ax-1cn 7935 ax-1re 7936 ax-icn 7937 ax-addcl 7938 ax-addrcl 7939 ax-mulcl 7940 ax-mulrcl 7941 ax-addcom 7942 ax-mulcom 7943 ax-addass 7944 ax-mulass 7945 ax-distr 7946 ax-i2m1 7947 ax-0lt1 7948 ax-1rid 7949 ax-0id 7950 ax-rnegex 7951 ax-precex 7952 ax-cnre 7953 ax-pre-ltirr 7954 ax-pre-ltwlin 7955 ax-pre-lttrn 7956 ax-pre-apti 7957 ax-pre-ltadd 7958 ax-pre-mulgt0 7959 ax-pre-mulext 7960 ax-arch 7961 ax-caucvg 7962

This theorem depends on definitions: df-bi 117 df-dc 836 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2041 df-mo 2042 df-clab 2176 df-cleq 2182 df-clel 2185 df-nfc 2321 df-ne 2361 df-nel 2456 df-ral 2473 df-rex 2474 df-reu 2475 df-rmo 2476 df-rab 2477 df-v 2754 df-sbc 2978 df-csb 3073 df-dif 3146 df-un 3148 df-in 3150 df-ss 3157 df-nul 3438 df-if 3550 df-pw 3592 df-sn 3613 df-pr 3614 df-tp 3615 df-op 3616 df-uni 3825 df-int 3860 df-iun 3903 df-br 4019 df-opab 4080 df-mpt 4081 df-tr 4117 df-id 4311 df-po 4314 df-iso 4315 df-iord 4384 df-on 4386 df-ilim 4387 df-suc 4389 df-iom 4608 df-xp 4650 df-rel 4651 df-cnv 4652 df-co 4653 df-dm 4654 df-rn 4655 df-res 4656 df-ima 4657 df-iota 5196 df-fun 5237 df-fn 5238 df-f 5239 df-f1 5240 df-fo 5241 df-f1o 5242 df-fv 5243 df-riota 5852 df-ov 5900 df-oprab 5901 df-mpo 5902 df-1st 6166 df-2nd 6167 df-recs 6331 df-frec 6417 df-pnf 8025 df-mnf 8026 df-xr 8027 df-ltxr 8028 df-le 8029 df-sub 8161 df-neg 8162 df-reap 8563 df-ap 8570 df-div 8661 df-inn 8951 df-2 9009 df-3 9010 df-4 9011 df-n0 9208 df-z 9285 df-uz 9560 df-rp 9686 df-seqfrec 10479 df-exp 10554 df-cj 10886 df-re 10887 df-im 10888 df-rsqrt 11042 df-abs 11043

This theorem is referenced by: lgscl1 14902

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