modm1p1ne - Mathbox for Alexander van der Vekens

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Theorem modm1p1ne 47368

Description: If an integer minus one equals another integer plus one modulo an integer greater than 4, then the first integer plus one is not equal to the second integer minus one modulo the same modulus. (Contributed by AV, 15-Nov-2025.)

**Hypothesis**
Ref	Expression
modm1nep1.i	⊢ 𝐼 = (0..^𝑁)

**Assertion**
Ref	Expression
modm1p1ne	⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → (((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁) → ((𝑌 + 1) mod 𝑁) ≠ ((𝑋 − 1) mod 𝑁)))

**Proof of Theorem modm1p1ne**
Step	Hyp	Ref	Expression
1		eluz2 12729	. . . . . . . . . 10 ⊢ (𝑁 ∈ (ℤ_≥‘5) ↔ (5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁))
2		4nn0 12391	. . . . . . . . . . . 12 ⊢ 4 ∈ ℕ₀
3	2	a1i 11	. . . . . . . . . . 11 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 4 ∈ ℕ₀)
4		simp2 1137	. . . . . . . . . . . 12 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 𝑁 ∈ ℤ)
5		0red 11106	. . . . . . . . . . . . 13 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 0 ∈ ℝ)
6		5re 12203	. . . . . . . . . . . . . 14 ⊢ 5 ∈ ℝ
7	6	a1i 11	. . . . . . . . . . . . 13 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 5 ∈ ℝ)
8		zre 12463	. . . . . . . . . . . . . 14 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ)
9	8	3ad2ant2 1134	. . . . . . . . . . . . 13 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 𝑁 ∈ ℝ)
10		5pos 12225	. . . . . . . . . . . . . 14 ⊢ 0 < 5
11	10	a1i 11	. . . . . . . . . . . . 13 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 0 < 5)
12		simp3 1138	. . . . . . . . . . . . 13 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 5 ≤ 𝑁)
13	5, 7, 9, 11, 12	ltletrd 11264	. . . . . . . . . . . 12 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 0 < 𝑁)
14		elnnz 12469	. . . . . . . . . . . 12 ⊢ (𝑁 ∈ ℕ ↔ (𝑁 ∈ ℤ ∧ 0 < 𝑁))
15	4, 13, 14	sylanbrc 583	. . . . . . . . . . 11 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 𝑁 ∈ ℕ)
16		4re 12200	. . . . . . . . . . . . 13 ⊢ 4 ∈ ℝ
17	16	a1i 11	. . . . . . . . . . . 12 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 4 ∈ ℝ)
18		4lt5 12288	. . . . . . . . . . . . 13 ⊢ 4 < 5
19	18	a1i 11	. . . . . . . . . . . 12 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 4 < 5)
20	17, 7, 9, 19, 12	ltletrd 11264	. . . . . . . . . . 11 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 4 < 𝑁)
21		elfzo0 13591	. . . . . . . . . . 11 ⊢ (4 ∈ (0..^𝑁) ↔ (4 ∈ ℕ₀ ∧ 𝑁 ∈ ℕ ∧ 4 < 𝑁))
22	3, 15, 20, 21	syl3anbrc 1344	. . . . . . . . . 10 ⊢ ((5 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 5 ≤ 𝑁) → 4 ∈ (0..^𝑁))
23	1, 22	sylbi 217	. . . . . . . . 9 ⊢ (𝑁 ∈ (ℤ_≥‘5) → 4 ∈ (0..^𝑁))
24		zmodidfzoimp 13793	. . . . . . . . 9 ⊢ (4 ∈ (0..^𝑁) → (4 mod 𝑁) = 4)
25	23, 24	syl 17	. . . . . . . 8 ⊢ (𝑁 ∈ (ℤ_≥‘5) → (4 mod 𝑁) = 4)
26		4ne0 12224	. . . . . . . . 9 ⊢ 4 ≠ 0
27	26	a1i 11	. . . . . . . 8 ⊢ (𝑁 ∈ (ℤ_≥‘5) → 4 ≠ 0)
28	25, 27	eqnetrd 2992	. . . . . . 7 ⊢ (𝑁 ∈ (ℤ_≥‘5) → (4 mod 𝑁) ≠ 0)
29		df-ne 2926	. . . . . . . 8 ⊢ (((4 · 1) mod 𝑁) ≠ 0 ↔ ¬ ((4 · 1) mod 𝑁) = 0)
30		4cn 12201	. . . . . . . . . . 11 ⊢ 4 ∈ ℂ
31	30	mulridi 11107	. . . . . . . . . 10 ⊢ (4 · 1) = 4
32	31	oveq1i 7350	. . . . . . . . 9 ⊢ ((4 · 1) mod 𝑁) = (4 mod 𝑁)
33	32	neeq1i 2989	. . . . . . . 8 ⊢ (((4 · 1) mod 𝑁) ≠ 0 ↔ (4 mod 𝑁) ≠ 0)
34	29, 33	bitr3i 277	. . . . . . 7 ⊢ (¬ ((4 · 1) mod 𝑁) = 0 ↔ (4 mod 𝑁) ≠ 0)
35	28, 34	sylibr 234	. . . . . 6 ⊢ (𝑁 ∈ (ℤ_≥‘5) → ¬ ((4 · 1) mod 𝑁) = 0)
36	35	3ad2ant1 1133	. . . . 5 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → ¬ ((4 · 1) mod 𝑁) = 0)
37	36	adantr 480	. . . 4 ⊢ (((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) ∧ ((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁)) → ¬ ((4 · 1) mod 𝑁) = 0)
38		uzuzle35 12776	. . . . . . . 8 ⊢ (𝑁 ∈ (ℤ_≥‘5) → 𝑁 ∈ (ℤ_≥‘3))
39		eluz3nn 12778	. . . . . . . 8 ⊢ (𝑁 ∈ (ℤ_≥‘3) → 𝑁 ∈ ℕ)
40	38, 39	syl 17	. . . . . . 7 ⊢ (𝑁 ∈ (ℤ_≥‘5) → 𝑁 ∈ ℕ)
41	40	3ad2ant1 1133	. . . . . 6 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → 𝑁 ∈ ℕ)
42		elfzoelz 13550	. . . . . . . 8 ⊢ (𝑋 ∈ (0..^𝑁) → 𝑋 ∈ ℤ)
43		modm1nep1.i	. . . . . . . 8 ⊢ 𝐼 = (0..^𝑁)
44	42, 43	eleq2s 2846	. . . . . . 7 ⊢ (𝑋 ∈ 𝐼 → 𝑋 ∈ ℤ)
45	44	3ad2ant2 1134	. . . . . 6 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → 𝑋 ∈ ℤ)
46		elfzoelz 13550	. . . . . . . 8 ⊢ (𝑌 ∈ (0..^𝑁) → 𝑌 ∈ ℤ)
47	46, 43	eleq2s 2846	. . . . . . 7 ⊢ (𝑌 ∈ 𝐼 → 𝑌 ∈ ℤ)
48	47	3ad2ant3 1135	. . . . . 6 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → 𝑌 ∈ ℤ)
49		1zzd 12494	. . . . . 6 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → 1 ∈ ℤ)
50		modmkpkne 47359	. . . . . 6 ⊢ ((𝑁 ∈ ℕ ∧ (𝑋 ∈ ℤ ∧ 𝑌 ∈ ℤ ∧ 1 ∈ ℤ)) → (((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁) → (((𝑌 + 1) mod 𝑁) = ((𝑋 − 1) mod 𝑁) ↔ ((4 · 1) mod 𝑁) = 0)))
51	41, 45, 48, 49, 50	syl13anc 1374	. . . . 5 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → (((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁) → (((𝑌 + 1) mod 𝑁) = ((𝑋 − 1) mod 𝑁) ↔ ((4 · 1) mod 𝑁) = 0)))
52	51	imp 406	. . . 4 ⊢ (((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) ∧ ((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁)) → (((𝑌 + 1) mod 𝑁) = ((𝑋 − 1) mod 𝑁) ↔ ((4 · 1) mod 𝑁) = 0))
53	37, 52	mtbird 325	. . 3 ⊢ (((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) ∧ ((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁)) → ¬ ((𝑌 + 1) mod 𝑁) = ((𝑋 − 1) mod 𝑁))
54	53	neqned 2932	. 2 ⊢ (((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) ∧ ((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁)) → ((𝑌 + 1) mod 𝑁) ≠ ((𝑋 − 1) mod 𝑁))
55	54	ex 412	1 ⊢ ((𝑁 ∈ (ℤ_≥‘5) ∧ 𝑋 ∈ 𝐼 ∧ 𝑌 ∈ 𝐼) → (((𝑌 − 1) mod 𝑁) = ((𝑋 + 1) mod 𝑁) → ((𝑌 + 1) mod 𝑁) ≠ ((𝑋 − 1) mod 𝑁)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 206 ∧ wa 395 ∧ w3a 1086 = wceq 1540 ∈ wcel 2109 ≠ wne 2925 class class class wbr 5088 ‘cfv 6476 (class class class)co 7340 ℝcr 10996 0cc0 10997 1c1 10998 + caddc 11000 · cmul 11002 < clt 11137 ≤ cle 11138 − cmin 11335 ℕcn 12116 3c3 12172 4c4 12173 5c5 12174 ℕ₀cn0 12372 ℤcz 12459 ℤ_≥cuz 12723 ..^cfzo 13545 mod cmo 13761

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2008 ax-8 2111 ax-9 2119 ax-10 2142 ax-11 2158 ax-12 2178 ax-ext 2701 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5367 ax-un 7662 ax-cnex 11053 ax-resscn 11054 ax-1cn 11055 ax-icn 11056 ax-addcl 11057 ax-addrcl 11058 ax-mulcl 11059 ax-mulrcl 11060 ax-mulcom 11061 ax-addass 11062 ax-mulass 11063 ax-distr 11064 ax-i2m1 11065 ax-1ne0 11066 ax-1rid 11067 ax-rnegex 11068 ax-rrecex 11069 ax-cnre 11070 ax-pre-lttri 11071 ax-pre-lttrn 11072 ax-pre-ltadd 11073 ax-pre-mulgt0 11074 ax-pre-sup 11075

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2533 df-eu 2562 df-clab 2708 df-cleq 2721 df-clel 2803 df-nfc 2878 df-ne 2926 df-nel 3030 df-ral 3045 df-rex 3054 df-rmo 3343 df-reu 3344 df-rab 3393 df-v 3435 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-iun 4940 df-br 5089 df-opab 5151 df-mpt 5170 df-tr 5196 df-id 5508 df-eprel 5513 df-po 5521 df-so 5522 df-fr 5566 df-we 5568 df-xp 5619 df-rel 5620 df-cnv 5621 df-co 5622 df-dm 5623 df-rn 5624 df-res 5625 df-ima 5626 df-pred 6243 df-ord 6304 df-on 6305 df-lim 6306 df-suc 6307 df-iota 6432 df-fun 6478 df-fn 6479 df-f 6480 df-f1 6481 df-fo 6482 df-f1o 6483 df-fv 6484 df-riota 7297 df-ov 7343 df-oprab 7344 df-mpo 7345 df-om 7791 df-1st 7915 df-2nd 7916 df-frecs 8205 df-wrecs 8236 df-recs 8285 df-rdg 8323 df-er 8616 df-en 8864 df-dom 8865 df-sdom 8866 df-sup 9320 df-inf 9321 df-pnf 11139 df-mnf 11140 df-xr 11141 df-ltxr 11142 df-le 11143 df-sub 11337 df-neg 11338 df-div 11766 df-nn 12117 df-2 12179 df-3 12180 df-4 12181 df-5 12182 df-n0 12373 df-z 12460 df-uz 12724 df-rp 12882 df-fz 13399 df-fzo 13546 df-fl 13684 df-mod 13762 df-dvds 16151

This theorem is referenced by: gpgedg2ov 48064

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