Theorem prm23lt5 15519

Description: A prime less than 5 is either 2 or 3. (Contributed by AV, 5-Jul-2021.)

Assertion

Ref	Expression
prm23lt5	|- ( ( P e. Prime /\ P < 5 ) -> ( P = 2 \/ P = 3 ) )

Proof of Theorem prm23lt5

Step	Hyp	Ref	Expression
1		prmnn 15388	. . . . 5 |- ( P e. Prime -> P e. NN )
2	1	nnnn0d 11351	. . . 4 |- ( P e. Prime -> P e. NN0 )
3	2	adantr 481	. . 3 |- ( ( P e. Prime /\ P < 5 ) -> P e. NN0 )
4		4nn0 11311	. . . 4 |- 4 e. NN0
5	4	a1i 11	. . 3 |- ( ( P e. Prime /\ P < 5 ) -> 4 e. NN0 )
6		df-5 11082	. . . . . 6 |- 5 = ( 4 + 1 )
7	6	breq2i 4661	. . . . 5 |- ( P < 5 <-> P < ( 4 + 1 ) )
8		prmz 15389	. . . . . . 7 |- ( P e. Prime -> P e. ZZ )
9		4z 11411	. . . . . . 7 |- 4 e. ZZ
10		zleltp1 11428	. . . . . . 7 |- ( ( P e. ZZ /\ 4 e. ZZ ) -> ( P <_ 4 <-> P < ( 4 + 1 ) ) )
11	8, 9, 10	sylancl 694	. . . . . 6 |- ( P e. Prime -> ( P <_ 4 <-> P < ( 4 + 1 ) ) )
12	11	biimprd 238	. . . . 5 |- ( P e. Prime -> ( P < ( 4 + 1 ) -> P <_ 4 ) )
13	7, 12	syl5bi 232	. . . 4 |- ( P e. Prime -> ( P < 5 -> P <_ 4 ) )
14	13	imp 445	. . 3 |- ( ( P e. Prime /\ P < 5 ) -> P <_ 4 )
15		elfz2nn0 12431	. . 3 |- ( P e. ( 0 ... 4 ) <-> ( P e. NN0 /\ 4 e. NN0 /\ P <_ 4 ) )
16	3, 5, 14, 15	syl3anbrc 1246	. 2 |- ( ( P e. Prime /\ P < 5 ) -> P e. ( 0 ... 4 ) )
17		fz0to4untppr 12442	. . . 4 |- ( 0 ... 4 ) = ( { 0 , 1 , 2 } u. { 3 , 4 } )
18	17	eleq2i 2693	. . 3 |- ( P e. ( 0 ... 4 ) <-> P e. ( { 0 , 1 , 2 } u. { 3 , 4 } ) )
19		elun 3753	. . . . . 6 |- ( P e. ( { 0 , 1 , 2 } u. { 3 , 4 } ) <-> ( P e. { 0 , 1 , 2 } \/ P e. { 3 , 4 } ) )
20		eltpi 4229	. . . . . . . 8 |- ( P e. { 0 , 1 , 2 } -> ( P = 0 \/ P = 1 \/ P = 2 ) )
21		nnne0 11053	. . . . . . . . . . 11 |- ( P e. NN -> P =/= 0 )
22		eqneqall 2805	. . . . . . . . . . . 12 |- ( P = 0 -> ( P =/= 0 -> ( P = 2 \/ P = 3 ) ) )
23	22	com12 32	. . . . . . . . . . 11 |- ( P =/= 0 -> ( P = 0 -> ( P = 2 \/ P = 3 ) ) )
24	1, 21, 23	3syl 18	. . . . . . . . . 10 |- ( P e. Prime -> ( P = 0 -> ( P = 2 \/ P = 3 ) ) )
25	24	com12 32	. . . . . . . . 9 |- ( P = 0 -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
26		eleq1 2689	. . . . . . . . . 10 |- ( P = 1 -> ( P e. Prime <-> 1 e. Prime ) )
27		1nprm 15392	. . . . . . . . . . 11 |- -. 1 e. Prime
28	27	pm2.21i 116	. . . . . . . . . 10 |- ( 1 e. Prime -> ( P = 2 \/ P = 3 ) )
29	26, 28	syl6bi 243	. . . . . . . . 9 |- ( P = 1 -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
30		orc 400	. . . . . . . . . 10 |- ( P = 2 -> ( P = 2 \/ P = 3 ) )
31	30	a1d 25	. . . . . . . . 9 |- ( P = 2 -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
32	25, 29, 31	3jaoi 1391	. . . . . . . 8 |- ( ( P = 0 \/ P = 1 \/ P = 2 ) -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
33	20, 32	syl 17	. . . . . . 7 |- ( P e. { 0 , 1 , 2 } -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
34		elpri 4197	. . . . . . . 8 |- ( P e. { 3 , 4 } -> ( P = 3 \/ P = 4 ) )
35		olc 399	. . . . . . . . . 10 |- ( P = 3 -> ( P = 2 \/ P = 3 ) )
36	35	a1d 25	. . . . . . . . 9 |- ( P = 3 -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
37		eleq1 2689	. . . . . . . . . 10 |- ( P = 4 -> ( P e. Prime <-> 4 e. Prime ) )
38		4nprm 15407	. . . . . . . . . . 11 |- -. 4 e. Prime
39	38	pm2.21i 116	. . . . . . . . . 10 |- ( 4 e. Prime -> ( P = 2 \/ P = 3 ) )
40	37, 39	syl6bi 243	. . . . . . . . 9 |- ( P = 4 -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
41	36, 40	jaoi 394	. . . . . . . 8 |- ( ( P = 3 \/ P = 4 ) -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
42	34, 41	syl 17	. . . . . . 7 |- ( P e. { 3 , 4 } -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
43	33, 42	jaoi 394	. . . . . 6 |- ( ( P e. { 0 , 1 , 2 } \/ P e. { 3 , 4 } ) -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
44	19, 43	sylbi 207	. . . . 5 |- ( P e. ( { 0 , 1 , 2 } u. { 3 , 4 } ) -> ( P e. Prime -> ( P = 2 \/ P = 3 ) ) )
45	44	com12 32	. . . 4 |- ( P e. Prime -> ( P e. ( { 0 , 1 , 2 } u. { 3 , 4 } ) -> ( P = 2 \/ P = 3 ) ) )
46	45	adantr 481	. . 3 |- ( ( P e. Prime /\ P < 5 ) -> ( P e. ( { 0 , 1 , 2 } u. { 3 , 4 } ) -> ( P = 2 \/ P = 3 ) ) )
47	18, 46	syl5bi 232	. 2 |- ( ( P e. Prime /\ P < 5 ) -> ( P e. ( 0 ... 4 ) -> ( P = 2 \/ P = 3 ) ) )
48	16, 47	mpd 15	1 |- ( ( P e. Prime /\ P < 5 ) -> ( P = 2 \/ P = 3 ) )

Syntax hints:   -> wi 4   <-> wb 196   \/ wo 383   /\ wa 384   \/ w3o 1036   = wceq 1483   e. wcel 1990   =/= wne 2794   u. cun 3572   {cpr 4179   {ctp 4181   class class class wbr 4653  (class class class)co 6650   0cc0 9936   1c1 9937   + caddc 9939   < clt 10074   <_ cle 10075   NNcn 11020   2c2 11070   3c3 11071   4c4 11072   5c5 11073   NN0cn0 11292   ZZcz 11377   ...cfz 12326   Primecprime 15385

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-8 1992  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pow 4843  ax-pr 4906  ax-un 6949  ax-cnex 9992  ax-resscn 9993  ax-1cn 9994  ax-icn 9995  ax-addcl 9996  ax-addrcl 9997  ax-mulcl 9998  ax-mulrcl 9999  ax-mulcom 10000  ax-addass 10001  ax-mulass 10002  ax-distr 10003  ax-i2m1 10004  ax-1ne0 10005  ax-1rid 10006  ax-rnegex 10007  ax-rrecex 10008  ax-cnre 10009  ax-pre-lttri 10010  ax-pre-lttrn 10011  ax-pre-ltadd 10012  ax-pre-mulgt0 10013  ax-pre-sup 10014

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1038  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ne 2795  df-nel 2898  df-ral 2917  df-rex 2918  df-reu 2919  df-rmo 2920  df-rab 2921  df-v 3202  df-sbc 3436  df-csb 3534  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-pss 3590  df-nul 3916  df-if 4087  df-pw 4160  df-sn 4178  df-pr 4180  df-tp 4182  df-op 4184  df-uni 4437  df-iun 4522  df-br 4654  df-opab 4713  df-mpt 4730  df-tr 4753  df-id 5024  df-eprel 5029  df-po 5035  df-so 5036  df-fr 5073  df-we 5075  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-dm 5124  df-rn 5125  df-res 5126  df-ima 5127  df-pred 5680  df-ord 5726  df-on 5727  df-lim 5728  df-suc 5729  df-iota 5851  df-fun 5890  df-fn 5891  df-f 5892  df-f1 5893  df-fo 5894  df-f1o 5895  df-fv 5896  df-riota 6611  df-ov 6653  df-oprab 6654  df-mpt2 6655  df-om 7066  df-1st 7168  df-2nd 7169  df-wrecs 7407  df-recs 7468  df-rdg 7506  df-1o 7560  df-2o 7561  df-er 7742  df-en 7956  df-dom 7957  df-sdom 7958  df-fin 7959  df-sup 8348  df-pnf 10076  df-mnf 10077  df-xr 10078  df-ltxr 10079  df-le 10080  df-sub 10268  df-neg 10269  df-div 10685  df-nn 11021  df-2 11079  df-3 11080  df-4 11081  df-5 11082  df-n0 11293  df-z 11378  df-uz 11688  df-rp 11833  df-fz 12327  df-seq 12802  df-exp 12861  df-cj 13839  df-re 13840  df-im 13841  df-sqrt 13975  df-abs 13976  df-dvds 14984  df-prm 15386

This theorem is referenced by:  prm23ge5  15520