Theorem ssfzunsnext 13597

Description: A subset of a finite sequence of integers extended by an integer is a subset of a (possibly extended) finite sequence of integers. (Contributed by AV, 13-Nov-2021.)

Assertion

Ref	Expression
ssfzunsnext	⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝑆 ∪ {𝐼}) ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))

Proof of Theorem ssfzunsnext

Dummy variable 𝑘 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl 487	. . 3 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → 𝑆 ⊆ (𝑀...𝑁))
2		simp3 1154	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝐼 ∈ ℤ)
3		simp1 1152	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑀 ∈ ℤ)
4	2, 3	ifcld 4539	. . . . . . . 8 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ∈ ℤ)
5	4	adantr 485	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ∈ ℤ)
6		simp2 1153	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑁 ∈ ℤ)
7	6, 2	ifcld 4539	. . . . . . . 8 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → if(𝐼 ≤ 𝑁, 𝑁, 𝐼) ∈ ℤ)
8	7	adantr 485	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑁, 𝑁, 𝐼) ∈ ℤ)
9		elfzelz 13552	. . . . . . . 8 ⊢ (𝑘 ∈ (𝑀...𝑁) → 𝑘 ∈ ℤ)
10	9	adantl 486	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑘 ∈ ℤ)
11	4	zred 12700	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ∈ ℝ)
12	11	adantr 485	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ∈ ℝ)
13		zre 12595	. . . . . . . . . 10 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℝ)
14	13	3ad2ant1 1149	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑀 ∈ ℝ)
15	14	adantr 485	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑀 ∈ ℝ)
16	9	zred 12700	. . . . . . . . 9 ⊢ (𝑘 ∈ (𝑀...𝑁) → 𝑘 ∈ ℝ)
17	16	adantl 486	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑘 ∈ ℝ)
18		zre 12595	. . . . . . . . . . . . 13 ⊢ (𝐼 ∈ ℤ → 𝐼 ∈ ℝ)
19	13, 18	anim12i 624	. . . . . . . . . . . 12 ⊢ ((𝑀 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑀 ∈ ℝ ∧ 𝐼 ∈ ℝ))
20	19	ancomd 466	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ))
21	20	3adant2 1147	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ))
22	21	adantr 485	. . . . . . . . 9 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → (𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ))
23		min2 13216	. . . . . . . . 9 ⊢ ((𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ≤ 𝑀)
24	22, 23	syl 18	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ≤ 𝑀)
25		elfzle1 13555	. . . . . . . . 9 ⊢ (𝑘 ∈ (𝑀...𝑁) → 𝑀 ≤ 𝑘)
26	25	adantl 486	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑀 ≤ 𝑘)
27	12, 15, 17, 24, 26	letrd 11367	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ≤ 𝑘)
28		zre 12595	. . . . . . . . . 10 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ)
29	28	3ad2ant2 1150	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑁 ∈ ℝ)
30	29	adantr 485	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑁 ∈ ℝ)
31	7	zred 12700	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → if(𝐼 ≤ 𝑁, 𝑁, 𝐼) ∈ ℝ)
32	31	adantr 485	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → if(𝐼 ≤ 𝑁, 𝑁, 𝐼) ∈ ℝ)
33		elfzle2 13556	. . . . . . . . 9 ⊢ (𝑘 ∈ (𝑀...𝑁) → 𝑘 ≤ 𝑁)
34	33	adantl 486	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑘 ≤ 𝑁)
35	28, 18	anim12i 624	. . . . . . . . . . . 12 ⊢ ((𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑁 ∈ ℝ ∧ 𝐼 ∈ ℝ))
36	35	3adant1 1146	. . . . . . . . . . 11 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑁 ∈ ℝ ∧ 𝐼 ∈ ℝ))
37	36	ancomd 466	. . . . . . . . . 10 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝐼 ∈ ℝ ∧ 𝑁 ∈ ℝ))
38		max2 13213	. . . . . . . . . 10 ⊢ ((𝐼 ∈ ℝ ∧ 𝑁 ∈ ℝ) → 𝑁 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
39	37, 38	syl 18	. . . . . . . . 9 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → 𝑁 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
40	39	adantr 485	. . . . . . . 8 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑁 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
41	17, 30, 32, 34, 40	letrd 11367	. . . . . . 7 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑘 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
42	5, 8, 10, 27, 41	elfzd 13543	. . . . . 6 ⊢ (((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) ∧ 𝑘 ∈ (𝑀...𝑁)) → 𝑘 ∈ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
43	42	ex 417	. . . . 5 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑘 ∈ (𝑀...𝑁) → 𝑘 ∈ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼))))
44	43	ssrdv 3951	. . . 4 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑀...𝑁) ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
45	44	adantl 486	. . 3 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝑀...𝑁) ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
46	1, 45	sstrd 3955	. 2 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → 𝑆 ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
47	4	adantl 486	. . . 4 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ∈ ℤ)
48	7	adantl 486	. . . 4 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → if(𝐼 ≤ 𝑁, 𝑁, 𝐼) ∈ ℤ)
49	2	adantl 486	. . . 4 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → 𝐼 ∈ ℤ)
50	19	3adant2 1147	. . . . . . 7 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ) → (𝑀 ∈ ℝ ∧ 𝐼 ∈ ℝ))
51	50	adantl 486	. . . . . 6 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝑀 ∈ ℝ ∧ 𝐼 ∈ ℝ))
52	51	ancomd 466	. . . . 5 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ))
53		min1 13215	. . . . 5 ⊢ ((𝐼 ∈ ℝ ∧ 𝑀 ∈ ℝ) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ≤ 𝐼)
54	52, 53	syl 18	. . . 4 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → if(𝐼 ≤ 𝑀, 𝐼, 𝑀) ≤ 𝐼)
55	36	adantl 486	. . . . . 6 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝑁 ∈ ℝ ∧ 𝐼 ∈ ℝ))
56	55	ancomd 466	. . . . 5 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝐼 ∈ ℝ ∧ 𝑁 ∈ ℝ))
57		max1 13211	. . . . 5 ⊢ ((𝐼 ∈ ℝ ∧ 𝑁 ∈ ℝ) → 𝐼 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
58	56, 57	syl 18	. . . 4 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → 𝐼 ≤ if(𝐼 ≤ 𝑁, 𝑁, 𝐼))
59	47, 48, 49, 54, 58	elfzd 13543	. . 3 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → 𝐼 ∈ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
60	59	snssd 4757	. 2 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → {𝐼} ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))
61	46, 60	unssd 4153	1 ⊢ ((𝑆 ⊆ (𝑀...𝑁) ∧ (𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ ∧ 𝐼 ∈ ℤ)) → (𝑆 ∪ {𝐼}) ⊆ (if(𝐼 ≤ 𝑀, 𝐼, 𝑀)...if(𝐼 ≤ 𝑁, 𝑁, 𝐼)))

Syntax hints:   → wi 4   ∧ wa 400   ∧ w3a 1101   ∈ wcel 2149   ∪ cun 3911   ⊆ wss 3913  ifcif 4492  {csn 4594   class class class wbr 5113  (class class class)co 7411  ℝcr 11099   ≤ cle 11244  ℤcz 12591  ...cfz 13535

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-sep 5261  ax-nul 5271  ax-pow 5337  ax-pr 5405  ax-un 7733  ax-cnex 11156  ax-resscn 11157  ax-pre-lttri 11174  ax-pre-lttrn 11175

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-nel 3071  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-uni 4877  df-iun 4962  df-br 5114  df-opab 5178  df-mpt 5197  df-id 5557  df-po 5570  df-so 5571  df-xp 5668  df-rel 5669  df-cnv 5670  df-co 5671  df-dm 5672  df-rn 5673  df-res 5674  df-ima 5675  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-f1 6542  df-fo 6543  df-f1o 6544  df-fv 6545  df-ov 7414  df-oprab 7415  df-mpo 7416  df-1st 7986  df-2nd 7987  df-er 8694  df-en 8944  df-dom 8945  df-sdom 8946  df-pnf 11245  df-mnf 11246  df-xr 11247  df-ltxr 11248  df-le 11249  df-neg 11444  df-z 12592  df-uz 12863  df-fz 13536

This theorem is referenced by:  ssfzunsn  13598  setsstruct2  17234