Theorem exbtwnzlemshrink 10248

Description: Lemma for exbtwnzlemex 10249. Shrinking the range around 𝐴. (Contributed by Jim Kingdon, 10-May-2022.)

Hypotheses

Ref	Expression
exbtwnzlemshrink.j	⊢ (𝜑 → 𝐽 ∈ ℕ)
exbtwnzlemshrink.a	⊢ (𝜑 → 𝐴 ∈ ℝ)
exbtwnzlemshrink.tri	⊢ ((𝜑 ∧ 𝑛 ∈ ℤ) → (𝑛 ≤ 𝐴 ∨ 𝐴 < 𝑛))

Assertion

Ref	Expression
exbtwnzlemshrink	⊢ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))

Distinct variable groups:   𝐴,𝑚,𝑛   𝑥,𝐴,𝑚   𝑚,𝐽   𝜑,𝑚,𝑛

Allowed substitution hints:   𝜑(𝑥)   𝐽(𝑥,𝑛)

Proof of Theorem exbtwnzlemshrink

Dummy variables 𝑘 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		exbtwnzlemshrink.j	. . 3 ⊢ (𝜑 → 𝐽 ∈ ℕ)
2	1	adantr 276	. 2 ⊢ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))) → 𝐽 ∈ ℕ)
3		oveq2 5882	. . . . . . . 8 ⊢ (𝑤 = 1 → (𝑚 + 𝑤) = (𝑚 + 1))
4	3	breq2d 4015	. . . . . . 7 ⊢ (𝑤 = 1 → (𝐴 < (𝑚 + 𝑤) ↔ 𝐴 < (𝑚 + 1)))
5	4	anbi2d 464	. . . . . 6 ⊢ (𝑤 = 1 → ((𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1))))
6	5	rexbidv 2478	. . . . 5 ⊢ (𝑤 = 1 → (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1))))
7	6	anbi2d 464	. . . 4 ⊢ (𝑤 = 1 → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) ↔ (𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1)))))
8	7	imbi1d 231	. . 3 ⊢ (𝑤 = 1 → (((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) ↔ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))))
9		oveq2 5882	. . . . . . . 8 ⊢ (𝑤 = 𝑘 → (𝑚 + 𝑤) = (𝑚 + 𝑘))
10	9	breq2d 4015	. . . . . . 7 ⊢ (𝑤 = 𝑘 → (𝐴 < (𝑚 + 𝑤) ↔ 𝐴 < (𝑚 + 𝑘)))
11	10	anbi2d 464	. . . . . 6 ⊢ (𝑤 = 𝑘 → ((𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘))))
12	11	rexbidv 2478	. . . . 5 ⊢ (𝑤 = 𝑘 → (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘))))
13	12	anbi2d 464	. . . 4 ⊢ (𝑤 = 𝑘 → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) ↔ (𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘)))))
14	13	imbi1d 231	. . 3 ⊢ (𝑤 = 𝑘 → (((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) ↔ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))))
15		oveq2 5882	. . . . . . . 8 ⊢ (𝑤 = (𝑘 + 1) → (𝑚 + 𝑤) = (𝑚 + (𝑘 + 1)))
16	15	breq2d 4015	. . . . . . 7 ⊢ (𝑤 = (𝑘 + 1) → (𝐴 < (𝑚 + 𝑤) ↔ 𝐴 < (𝑚 + (𝑘 + 1))))
17	16	anbi2d 464	. . . . . 6 ⊢ (𝑤 = (𝑘 + 1) → ((𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))))
18	17	rexbidv 2478	. . . . 5 ⊢ (𝑤 = (𝑘 + 1) → (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))))
19	18	anbi2d 464	. . . 4 ⊢ (𝑤 = (𝑘 + 1) → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) ↔ (𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1))))))
20	19	imbi1d 231	. . 3 ⊢ (𝑤 = (𝑘 + 1) → (((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) ↔ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))))
21		oveq2 5882	. . . . . . . 8 ⊢ (𝑤 = 𝐽 → (𝑚 + 𝑤) = (𝑚 + 𝐽))
22	21	breq2d 4015	. . . . . . 7 ⊢ (𝑤 = 𝐽 → (𝐴 < (𝑚 + 𝑤) ↔ 𝐴 < (𝑚 + 𝐽)))
23	22	anbi2d 464	. . . . . 6 ⊢ (𝑤 = 𝐽 → ((𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))))
24	23	rexbidv 2478	. . . . 5 ⊢ (𝑤 = 𝐽 → (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤)) ↔ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))))
25	24	anbi2d 464	. . . 4 ⊢ (𝑤 = 𝐽 → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) ↔ (𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽)))))
26	25	imbi1d 231	. . 3 ⊢ (𝑤 = 𝐽 → (((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑤))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) ↔ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))))
27		breq1 4006	. . . . . . 7 ⊢ (𝑚 = 𝑥 → (𝑚 ≤ 𝐴 ↔ 𝑥 ≤ 𝐴))
28		oveq1 5881	. . . . . . . 8 ⊢ (𝑚 = 𝑥 → (𝑚 + 1) = (𝑥 + 1))
29	28	breq2d 4015	. . . . . . 7 ⊢ (𝑚 = 𝑥 → (𝐴 < (𝑚 + 1) ↔ 𝐴 < (𝑥 + 1)))
30	27, 29	anbi12d 473	. . . . . 6 ⊢ (𝑚 = 𝑥 → ((𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1)) ↔ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))))
31	30	cbvrexv 2704	. . . . 5 ⊢ (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1)) ↔ ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))
32	31	biimpi 120	. . . 4 ⊢ (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1)) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))
33	32	adantl 277	. . 3 ⊢ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 1))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))
34		simpl 109	. . . . . . 7 ⊢ ((𝑘 ∈ ℕ ∧ 𝜑) → 𝑘 ∈ ℕ)
35		exbtwnzlemshrink.a	. . . . . . . 8 ⊢ (𝜑 → 𝐴 ∈ ℝ)
36	35	adantl 277	. . . . . . 7 ⊢ ((𝑘 ∈ ℕ ∧ 𝜑) → 𝐴 ∈ ℝ)
37		exbtwnzlemshrink.tri	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑛 ∈ ℤ) → (𝑛 ≤ 𝐴 ∨ 𝐴 < 𝑛))
38	37	adantll 476	. . . . . . 7 ⊢ (((𝑘 ∈ ℕ ∧ 𝜑) ∧ 𝑛 ∈ ℤ) → (𝑛 ≤ 𝐴 ∨ 𝐴 < 𝑛))
39	34, 36, 38	exbtwnzlemstep 10247	. . . . . 6 ⊢ (((𝑘 ∈ ℕ ∧ 𝜑) ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))) → ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘)))
40	39	ex 115	. . . . 5 ⊢ ((𝑘 ∈ ℕ ∧ 𝜑) → (∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1))) → ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘))))
41	40	imdistanda 448	. . . 4 ⊢ (𝑘 ∈ ℕ → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))) → (𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘)))))
42	41	imim1d 75	. . 3 ⊢ (𝑘 ∈ ℕ → (((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝑘))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))) → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + (𝑘 + 1)))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))))
43	8, 14, 20, 26, 33, 42	nnind 8934	. 2 ⊢ (𝐽 ∈ ℕ → ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1))))
44	2, 43	mpcom 36	1 ⊢ ((𝜑 ∧ ∃𝑚 ∈ ℤ (𝑚 ≤ 𝐴 ∧ 𝐴 < (𝑚 + 𝐽))) → ∃𝑥 ∈ ℤ (𝑥 ≤ 𝐴 ∧ 𝐴 < (𝑥 + 1)))

Syntax hints:   → wi 4   ∧ wa 104   ∨ wo 708   = wceq 1353   ∈ wcel 2148  ∃wrex 2456   class class class wbr 4003  (class class class)co 5874  ℝcr 7809  1c1 7811   + caddc 7813   < clt 7991   ≤ cle 7992  ℕcn 8918  ℤcz 9252

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 4121  ax-pow 4174  ax-pr 4209  ax-un 4433  ax-setind 4536  ax-cnex 7901  ax-resscn 7902  ax-1cn 7903  ax-1re 7904  ax-icn 7905  ax-addcl 7906  ax-addrcl 7907  ax-mulcl 7908  ax-addcom 7910  ax-addass 7912  ax-distr 7914  ax-i2m1 7915  ax-0lt1 7916  ax-0id 7918  ax-rnegex 7919  ax-cnre 7921  ax-pre-ltirr 7922  ax-pre-ltwlin 7923  ax-pre-lttrn 7924  ax-pre-ltadd 7926

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-reu 2462  df-rab 2464  df-v 2739  df-sbc 2963  df-dif 3131  df-un 3133  df-in 3135  df-ss 3142  df-pw 3577  df-sn 3598  df-pr 3599  df-op 3601  df-uni 3810  df-int 3845  df-br 4004  df-opab 4065  df-id 4293  df-xp 4632  df-rel 4633  df-cnv 4634  df-co 4635  df-dm 4636  df-iota 5178  df-fun 5218  df-fv 5224  df-riota 5830  df-ov 5877  df-oprab 5878  df-mpo 5879  df-pnf 7993  df-mnf 7994  df-xr 7995  df-ltxr 7996  df-le 7997  df-sub 8129  df-neg 8130  df-inn 8919  df-n0 9176  df-z 9253

This theorem is referenced by:  exbtwnzlemex  10249