Theorem frecfzen2 10362

Description: The cardinality of a finite set of sequential integers with arbitrary endpoints. (Contributed by Jim Kingdon, 18-May-2020.)

Hypothesis

Ref	Expression
frecfzennn.1	|- G = frec ( ( x e. ZZ |-> ( x + 1 ) ) , 0 )

Assertion

Ref	Expression
frecfzen2	|- ( N e. ( ZZ>= ` M ) -> ( M ... N ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) )

Proof of Theorem frecfzen2

Step	Hyp	Ref	Expression
1		eluzel2 9471	. . . 4 |- ( N e. ( ZZ>= ` M ) -> M e. ZZ )
2		eluzelz 9475	. . . 4 |- ( N e. ( ZZ>= ` M ) -> N e. ZZ )
3		1z 9217	. . . . 5 |- 1 e. ZZ
4		zsubcl 9232	. . . . 5 |- ( ( 1 e. ZZ /\ M e. ZZ ) -> ( 1 - M ) e. ZZ )
5	3, 1, 4	sylancr 411	. . . 4 |- ( N e. ( ZZ>= ` M ) -> ( 1 - M ) e. ZZ )
6		fzen 9978	. . . 4 |- ( ( M e. ZZ /\ N e. ZZ /\ ( 1 - M ) e. ZZ ) -> ( M ... N ) ~~ ( ( M + ( 1 - M ) ) ... ( N + ( 1 - M ) ) ) )
7	1, 2, 5, 6	syl3anc 1228	. . 3 |- ( N e. ( ZZ>= ` M ) -> ( M ... N ) ~~ ( ( M + ( 1 - M ) ) ... ( N + ( 1 - M ) ) ) )
8	1	zcnd 9314	. . . . 5 |- ( N e. ( ZZ>= ` M ) -> M e. CC )
9		ax-1cn 7846	. . . . 5 |- 1 e. CC
10		pncan3 8106	. . . . 5 |- ( ( M e. CC /\ 1 e. CC ) -> ( M + ( 1 - M ) ) = 1 )
11	8, 9, 10	sylancl 410	. . . 4 |- ( N e. ( ZZ>= ` M ) -> ( M + ( 1 - M ) ) = 1 )
12		zcn 9196	. . . . . . 7 |- ( N e. ZZ -> N e. CC )
13		zcn 9196	. . . . . . 7 |- ( M e. ZZ -> M e. CC )
14		addsubass 8108	. . . . . . . 8 |- ( ( N e. CC /\ 1 e. CC /\ M e. CC ) -> ( ( N + 1 ) - M ) = ( N + ( 1 - M ) ) )
15	9, 14	mp3an2 1315	. . . . . . 7 |- ( ( N e. CC /\ M e. CC ) -> ( ( N + 1 ) - M ) = ( N + ( 1 - M ) ) )
16	12, 13, 15	syl2an 287	. . . . . 6 |- ( ( N e. ZZ /\ M e. ZZ ) -> ( ( N + 1 ) - M ) = ( N + ( 1 - M ) ) )
17	2, 1, 16	syl2anc 409	. . . . 5 |- ( N e. ( ZZ>= ` M ) -> ( ( N + 1 ) - M ) = ( N + ( 1 - M ) ) )
18	17	eqcomd 2171	. . . 4 |- ( N e. ( ZZ>= ` M ) -> ( N + ( 1 - M ) ) = ( ( N + 1 ) - M ) )
19	11, 18	oveq12d 5860	. . 3 |- ( N e. ( ZZ>= ` M ) -> ( ( M + ( 1 - M ) ) ... ( N + ( 1 - M ) ) ) = ( 1 ... ( ( N + 1 ) - M ) ) )
20	7, 19	breqtrd 4008	. 2 |- ( N e. ( ZZ>= ` M ) -> ( M ... N ) ~~ ( 1 ... ( ( N + 1 ) - M ) ) )
21		peano2uz 9521	. . 3 |- ( N e. ( ZZ>= ` M ) -> ( N + 1 ) e. ( ZZ>= ` M ) )
22		uznn0sub 9497	. . 3 |- ( ( N + 1 ) e. ( ZZ>= ` M ) -> ( ( N + 1 ) - M ) e. NN0 )
23		frecfzennn.1	. . . 4 |- G = frec ( ( x e. ZZ |-> ( x + 1 ) ) , 0 )
24	23	frecfzennn 10361	. . 3 |- ( ( ( N + 1 ) - M ) e. NN0 -> ( 1 ... ( ( N + 1 ) - M ) ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) )
25	21, 22, 24	3syl 17	. 2 |- ( N e. ( ZZ>= ` M ) -> ( 1 ... ( ( N + 1 ) - M ) ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) )
26		entr 6750	. 2 |- ( ( ( M ... N ) ~~ ( 1 ... ( ( N + 1 ) - M ) ) /\ ( 1 ... ( ( N + 1 ) - M ) ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) ) -> ( M ... N ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) )
27	20, 25, 26	syl2anc 409	1 |- ( N e. ( ZZ>= ` M ) -> ( M ... N ) ~~ ( `' G ` ( ( N + 1 ) - M ) ) )

Syntax hints:   -> wi 4   = wceq 1343   e. wcel 2136   class class class wbr 3982   |-> cmpt 4043   `'ccnv 4603   ` cfv 5188  (class class class)co 5842  freccfrec 6358   ~~ cen 6704   CCcc 7751   0cc0 7753   1c1 7754   + caddc 7756   - cmin 8069   NN0cn0 9114   ZZcz 9191   ZZ>=cuz 9466   ...cfz 9944

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ie1 1481  ax-ie2 1482  ax-8 1492  ax-10 1493  ax-11 1494  ax-i12 1495  ax-bndl 1497  ax-4 1498  ax-17 1514  ax-i9 1518  ax-ial 1522  ax-i5r 1523  ax-13 2138  ax-14 2139  ax-ext 2147  ax-coll 4097  ax-sep 4100  ax-nul 4108  ax-pow 4153  ax-pr 4187  ax-un 4411  ax-setind 4514  ax-iinf 4565  ax-cnex 7844  ax-resscn 7845  ax-1cn 7846  ax-1re 7847  ax-icn 7848  ax-addcl 7849  ax-addrcl 7850  ax-mulcl 7851  ax-addcom 7853  ax-addass 7855  ax-distr 7857  ax-i2m1 7858  ax-0lt1 7859  ax-0id 7861  ax-rnegex 7862  ax-cnre 7864  ax-pre-ltirr 7865  ax-pre-ltwlin 7866  ax-pre-lttrn 7867  ax-pre-apti 7868  ax-pre-ltadd 7869

This theorem depends on definitions:  df-bi 116  df-3or 969  df-3an 970  df-tru 1346  df-fal 1349  df-nf 1449  df-sb 1751  df-eu 2017  df-mo 2018  df-clab 2152  df-cleq 2158  df-clel 2161  df-nfc 2297  df-ne 2337  df-nel 2432  df-ral 2449  df-rex 2450  df-reu 2451  df-rab 2453  df-v 2728  df-sbc 2952  df-csb 3046  df-dif 3118  df-un 3120  df-in 3122  df-ss 3129  df-nul 3410  df-pw 3561  df-sn 3582  df-pr 3583  df-op 3585  df-uni 3790  df-int 3825  df-iun 3868  df-br 3983  df-opab 4044  df-mpt 4045  df-tr 4081  df-id 4271  df-iord 4344  df-on 4346  df-ilim 4347  df-suc 4349  df-iom 4568  df-xp 4610  df-rel 4611  df-cnv 4612  df-co 4613  df-dm 4614  df-rn 4615  df-res 4616  df-ima 4617  df-iota 5153  df-fun 5190  df-fn 5191  df-f 5192  df-f1 5193  df-fo 5194  df-f1o 5195  df-fv 5196  df-riota 5798  df-ov 5845  df-oprab 5846  df-mpo 5847  df-1st 6108  df-2nd 6109  df-recs 6273  df-frec 6359  df-1o 6384  df-er 6501  df-en 6707  df-pnf 7935  df-mnf 7936  df-xr 7937  df-ltxr 7938  df-le 7939  df-sub 8071  df-neg 8072  df-inn 8858  df-n0 9115  df-z 9192  df-uz 9467  df-fz 9945

This theorem is referenced by:  fzfig  10365