Theorem apbtwnz 9830

Description: There is a unique greatest integer less than or equal to a real number which is apart from all integers. (Contributed by Jim Kingdon, 11-May-2022.)

Assertion

Ref	Expression
apbtwnz	|- ( ( A e. RR /\ A. n e. ZZ A # n ) -> E! x e. ZZ ( x <_ A /\ A < ( x + 1 ) ) )

Distinct variable group:   A, n, x

Proof of Theorem apbtwnz

Dummy variable m is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl 108	. . 3 |- ( ( A e. RR /\ A. n e. ZZ A # n ) -> A e. RR )
2		simpr 109	. . . . 5 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ A < m ) -> A < m )
3	2	olcd 691	. . . 4 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ A < m ) -> ( m <_ A \/ A < m ) )
4		simpr 109	. . . . . . . 8 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> m e. ZZ )
5	4	zred 8967	. . . . . . 7 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> m e. RR )
6	5	adantr 271	. . . . . 6 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ m < A ) -> m e. RR )
7	1	adantr 271	. . . . . . 7 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> A e. RR )
8	7	adantr 271	. . . . . 6 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ m < A ) -> A e. RR )
9		simpr 109	. . . . . 6 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ m < A ) -> m < A )
10	6, 8, 9	ltled 7699	. . . . 5 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ m < A ) -> m <_ A )
11	10	orcd 690	. . . 4 |- ( ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) /\ m < A ) -> ( m <_ A \/ A < m ) )
12		breq2 3871	. . . . . 6 |- ( n = m -> ( A # n <-> A # m ) )
13		simplr 498	. . . . . 6 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> A. n e. ZZ A # n )
14	12, 13, 4	rspcdva 2741	. . . . 5 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> A # m )
15		reaplt 8162	. . . . . 6 |- ( ( A e. RR /\ m e. RR ) -> ( A # m <-> ( A < m \/ m < A ) ) )
16	7, 5, 15	syl2anc 404	. . . . 5 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> ( A # m <-> ( A < m \/ m < A ) ) )
17	14, 16	mpbid 146	. . . 4 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> ( A < m \/ m < A ) )
18	3, 11, 17	mpjaodan 750	. . 3 |- ( ( ( A e. RR /\ A. n e. ZZ A # n ) /\ m e. ZZ ) -> ( m <_ A \/ A < m ) )
19	1, 18	exbtwnzlemex 9810	. 2 |- ( ( A e. RR /\ A. n e. ZZ A # n ) -> E. x e. ZZ ( x <_ A /\ A < ( x + 1 ) ) )
20	19, 1	exbtwnz 9811	1 |- ( ( A e. RR /\ A. n e. ZZ A # n ) -> E! x e. ZZ ( x <_ A /\ A < ( x + 1 ) ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   \/ wo 667   e. wcel 1445   A.wral 2370   E!wreu 2372   class class class wbr 3867  (class class class)co 5690   RRcr 7446   1c1 7448   + caddc 7450   < clt 7619   <_ cle 7620   # cap 8155   ZZcz 8848

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 582  ax-in2 583  ax-io 668  ax-5 1388  ax-7 1389  ax-gen 1390  ax-ie1 1434  ax-ie2 1435  ax-8 1447  ax-10 1448  ax-11 1449  ax-i12 1450  ax-bndl 1451  ax-4 1452  ax-13 1456  ax-14 1457  ax-17 1471  ax-i9 1475  ax-ial 1479  ax-i5r 1480  ax-ext 2077  ax-sep 3978  ax-pow 4030  ax-pr 4060  ax-un 4284  ax-setind 4381  ax-cnex 7533  ax-resscn 7534  ax-1cn 7535  ax-1re 7536  ax-icn 7537  ax-addcl 7538  ax-addrcl 7539  ax-mulcl 7540  ax-mulrcl 7541  ax-addcom 7542  ax-mulcom 7543  ax-addass 7544  ax-mulass 7545  ax-distr 7546  ax-i2m1 7547  ax-0lt1 7548  ax-1rid 7549  ax-0id 7550  ax-rnegex 7551  ax-precex 7552  ax-cnre 7553  ax-pre-ltirr 7554  ax-pre-ltwlin 7555  ax-pre-lttrn 7556  ax-pre-apti 7557  ax-pre-ltadd 7558  ax-pre-mulgt0 7559  ax-arch 7561

This theorem depends on definitions:  df-bi 116  df-3or 928  df-3an 929  df-tru 1299  df-fal 1302  df-nf 1402  df-sb 1700  df-eu 1958  df-mo 1959  df-clab 2082  df-cleq 2088  df-clel 2091  df-nfc 2224  df-ne 2263  df-nel 2358  df-ral 2375  df-rex 2376  df-reu 2377  df-rmo 2378  df-rab 2379  df-v 2635  df-sbc 2855  df-dif 3015  df-un 3017  df-in 3019  df-ss 3026  df-pw 3451  df-sn 3472  df-pr 3473  df-op 3475  df-uni 3676  df-int 3711  df-br 3868  df-opab 3922  df-id 4144  df-xp 4473  df-rel 4474  df-cnv 4475  df-co 4476  df-dm 4477  df-iota 5014  df-fun 5051  df-fv 5057  df-riota 5646  df-ov 5693  df-oprab 5694  df-mpt2 5695  df-pnf 7621  df-mnf 7622  df-xr 7623  df-ltxr 7624  df-le 7625  df-sub 7752  df-neg 7753  df-reap 8149  df-ap 8156  df-inn 8521  df-n0 8772  df-z 8849

This theorem is referenced by:  flapcl  9831