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Theorem nprm 12264
Description: A product of two integers greater than one is composite. (Contributed by Mario Carneiro, 20-Jun-2015.)
Assertion
Ref Expression
nprm |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> -. ( A x. B ) e. Prime )
Proof of Theorem nprm
Dummy variable x is distinct from all other variables.
StepHypRef Expression
1 eluzelz 9604 . . . . 5 |- ( A e. ( ZZ>= ` 2 ) -> A e. ZZ )
21adantr 276 . . . 4 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A e. ZZ )
32zred 9442 . . 3 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A e. RR )
4 eluz2b2 9671 . . . . . 6 |- ( B e. ( ZZ>= ` 2 ) <-> ( B e. NN /\ 1 < B ) )
54simprbi 275 . . . . 5 |- ( B e. ( ZZ>= ` 2 ) -> 1 < B )
65adantl 277 . . . 4 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> 1 < B )
7 eluzelz 9604 . . . . . . 7 |- ( B e. ( ZZ>= ` 2 ) -> B e. ZZ )
87adantl 277 . . . . . 6 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> B e. ZZ )
98zred 9442 . . . . 5 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> B e. RR )
10 eluz2nn 9634 . . . . . . 7 |- ( A e. ( ZZ>= ` 2 ) -> A e. NN )
1110adantr 276 . . . . . 6 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A e. NN )
1211nngt0d 9028 . . . . 5 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> 0 < A )
13 ltmulgt11 8885 . . . . 5 |- ( ( A e. RR /\ B e. RR /\ 0 < A ) -> ( 1 < B <-> A < ( A x. B ) ) )
143, 9, 12, 13syl3anc 1249 . . . 4 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> ( 1 < B <-> A < ( A x. B ) ) )
156, 14mpbid 147 . . 3 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A < ( A x. B ) )
163, 15ltned 8135 . 2 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A =/= ( A x. B ) )
17 dvdsmul1 11959 . . . . 5 |- ( ( A e. ZZ /\ B e. ZZ ) -> A || ( A x. B ) )
181, 7, 17syl2an 289 . . . 4 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> A || ( A x. B ) )
19 isprm4 12260 . . . . . . 7 |- ( ( A x. B ) e. Prime <-> ( ( A x. B ) e. ( ZZ>= ` 2 ) /\ A. x e. ( ZZ>= ` 2 ) ( x || ( A x. B ) -> x = ( A x. B ) ) ) )
2019simprbi 275 . . . . . 6 |- ( ( A x. B ) e. Prime -> A. x e. ( ZZ>= ` 2 ) ( x || ( A x. B ) -> x = ( A x. B ) ) )
21 breq1 4033 . . . . . . . 8 |- ( x = A -> ( x || ( A x. B ) <-> A || ( A x. B ) ) )
22 eqeq1 2200 . . . . . . . 8 |- ( x = A -> ( x = ( A x. B ) <-> A = ( A x. B ) ) )
2321, 22imbi12d 234 . . . . . . 7 |- ( x = A -> ( ( x || ( A x. B ) -> x = ( A x. B ) ) <-> ( A || ( A x. B ) -> A = ( A x. B ) ) ) )
2423rspcv 2861 . . . . . 6 |- ( A e. ( ZZ>= ` 2 ) -> ( A. x e. ( ZZ>= ` 2 ) ( x || ( A x. B ) -> x = ( A x. B ) ) -> ( A || ( A x. B ) -> A = ( A x. B ) ) ) )
2520, 24syl5 32 . . . . 5 |- ( A e. ( ZZ>= ` 2 ) -> ( ( A x. B ) e. Prime -> ( A || ( A x. B ) -> A = ( A x. B ) ) ) )
2625adantr 276 . . . 4 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> ( ( A x. B ) e. Prime -> ( A || ( A x. B ) -> A = ( A x. B ) ) ) )
2718, 26mpid 42 . . 3 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> ( ( A x. B ) e. Prime -> A = ( A x. B ) ) )
2827necon3ad 2406 . 2 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> ( A =/= ( A x. B ) -> -. ( A x. B ) e. Prime ) )
2916, 28mpd 13 1 |- ( ( A e. ( ZZ>= ` 2 ) /\ B e. ( ZZ>= ` 2 ) ) -> -. ( A x. B ) e. Prime )
Colors of variables: wff set class
Syntax hints:   -. wn 3   -> wi 4   /\ wa 104   <-> wb 105   = wceq 1364   e. wcel 2164   =/= wne 2364   A.wral 2472   class class class wbr 4030   ` cfv 5255  (class class class)co 5919   RRcr 7873   0cc0 7874   1c1 7875   x. cmul 7879   < clt 8056   NNcn 8984   2c2 9035   ZZcz 9320   ZZ>=cuz 9595   || cdvds 11933   Primecprime 12248
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 615  ax-in2 616  ax-io 710  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-13 2166  ax-14 2167  ax-ext 2175  ax-coll 4145  ax-sep 4148  ax-nul 4156  ax-pow 4204  ax-pr 4239  ax-un 4465  ax-setind 4570  ax-iinf 4621  ax-cnex 7965  ax-resscn 7966  ax-1cn 7967  ax-1re 7968  ax-icn 7969  ax-addcl 7970  ax-addrcl 7971  ax-mulcl 7972  ax-mulrcl 7973  ax-addcom 7974  ax-mulcom 7975  ax-addass 7976  ax-mulass 7977  ax-distr 7978  ax-i2m1 7979  ax-0lt1 7980  ax-1rid 7981  ax-0id 7982  ax-rnegex 7983  ax-precex 7984  ax-cnre 7985  ax-pre-ltirr 7986  ax-pre-ltwlin 7987  ax-pre-lttrn 7988  ax-pre-apti 7989  ax-pre-ltadd 7990  ax-pre-mulgt0 7991  ax-pre-mulext 7992  ax-arch 7993  ax-caucvg 7994
This theorem depends on definitions:  df-bi 117  df-dc 836  df-3or 981  df-3an 982  df-tru 1367  df-fal 1370  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ne 2365  df-nel 2460  df-ral 2477  df-rex 2478  df-reu 2479  df-rmo 2480  df-rab 2481  df-v 2762  df-sbc 2987  df-csb 3082  df-dif 3156  df-un 3158  df-in 3160  df-ss 3167  df-nul 3448  df-if 3559  df-pw 3604  df-sn 3625  df-pr 3626  df-op 3628  df-uni 3837  df-int 3872  df-iun 3915  df-br 4031  df-opab 4092  df-mpt 4093  df-tr 4129  df-id 4325  df-po 4328  df-iso 4329  df-iord 4398  df-on 4400  df-ilim 4401  df-suc 4403  df-iom 4624  df-xp 4666  df-rel 4667  df-cnv 4668  df-co 4669  df-dm 4670  df-rn 4671  df-res 4672  df-ima 4673  df-iota 5216  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-riota 5874  df-ov 5922  df-oprab 5923  df-mpo 5924  df-1st 6195  df-2nd 6196  df-recs 6360  df-frec 6446  df-1o 6471  df-2o 6472  df-er 6589  df-en 6797  df-pnf 8058  df-mnf 8059  df-xr 8060  df-ltxr 8061  df-le 8062  df-sub 8194  df-neg 8195  df-reap 8596  df-ap 8603  df-div 8694  df-inn 8985  df-2 9043  df-3 9044  df-4 9045  df-n0 9244  df-z 9321  df-uz 9596  df-q 9688  df-rp 9723  df-seqfrec 10522  df-exp 10613  df-cj 10989  df-re 10990  df-im 10991  df-rsqrt 11145  df-abs 11146  df-dvds 11934  df-prm 12249
This theorem is referenced by:  nprmi  12265  dvdsnprmd  12266  sqnprm  12277
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