Theorem sqrt2irrap 11650

Description: The square root of 2 is irrational. That is, for any rational number, ( sqr ` 2 ) is apart from it. In the absence of excluded middle, we can distinguish between this and "the square root of 2 is not rational" which is sqrt2irr 11633. (Contributed by Jim Kingdon, 2-Oct-2021.)

Assertion

Ref	Expression
sqrt2irrap	|- ( Q e. QQ -> ( sqr ` 2 ) # Q )

Proof of Theorem sqrt2irrap

Dummy variables a b are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		elq 9264	. . 3 |- ( Q e. QQ <-> E. a e. ZZ E. b e. NN Q = ( a / b ) )
2	1	biimpi 119	. 2 |- ( Q e. QQ -> E. a e. ZZ E. b e. NN Q = ( a / b ) )
3		simplrl 505	. . . . . . . . 9 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> a e. ZZ )
4	3	adantr 272	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. ZZ )
5		simplrr 506	. . . . . . . . 9 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> b e. NN )
6	5	adantr 272	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. NN )
7		znq 9266	. . . . . . . . 9 |- ( ( a e. ZZ /\ b e. NN ) -> ( a / b ) e. QQ )
8		qre 9267	. . . . . . . . 9 |- ( ( a / b ) e. QQ -> ( a / b ) e. RR )
9	7, 8	syl 14	. . . . . . . 8 |- ( ( a e. ZZ /\ b e. NN ) -> ( a / b ) e. RR )
10	4, 6, 9	syl2anc 406	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) e. RR )
11		sqrt2re 11634	. . . . . . . 8 |- ( sqr ` 2 ) e. RR
12	11	a1i 9	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( sqr ` 2 ) e. RR )
13		0red 7639	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 e. RR )
14	4	zcnd 9026	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. CC )
15	6	nncnd 8592	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. CC )
16	6	nnap0d 8624	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b # 0 )
17	14, 15, 16	divrecapd 8414	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) = ( a x. ( 1 / b ) ) )
18	4	zred 9025	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. RR )
19	6	nnrecred 8625	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( 1 / b ) e. RR )
20		simpr 109	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a <_ 0 )
21		1red 7653	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 1 e. RR )
22	6	nnrpd 9329	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. RR+ )
23		0le1 8110	. . . . . . . . . . . 12 |- 0 <_ 1
24	23	a1i 9	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 <_ 1 )
25	21, 22, 24	divge0d 9371	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 <_ ( 1 / b ) )
26		mulle0r 8560	. . . . . . . . . 10 |- ( ( ( a e. RR /\ ( 1 / b ) e. RR ) /\ ( a <_ 0 /\ 0 <_ ( 1 / b ) ) ) -> ( a x. ( 1 / b ) ) <_ 0 )
27	18, 19, 20, 25, 26	syl22anc 1185	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a x. ( 1 / b ) ) <_ 0 )
28	17, 27	eqbrtrd 3895	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) <_ 0 )
29		2re 8648	. . . . . . . . . 10 |- 2 e. RR
30		2pos 8669	. . . . . . . . . 10 |- 0 < 2
31	29, 30	sqrtgt0ii 10743	. . . . . . . . 9 |- 0 < ( sqr ` 2 )
32	31	a1i 9	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 < ( sqr ` 2 ) )
33	10, 13, 12, 28, 32	lelttrd 7758	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) < ( sqr ` 2 ) )
34	10, 12, 33	gtapd 8264	. . . . . 6 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( sqr ` 2 ) # ( a / b ) )
35	3	adantr 272	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> a e. ZZ )
36		simpr 109	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> 0 < a )
37		elnnz 8916	. . . . . . . 8 |- ( a e. NN <-> ( a e. ZZ /\ 0 < a ) )
38	35, 36, 37	sylanbrc 411	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> a e. NN )
39	5	adantr 272	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> b e. NN )
40		sqrt2irraplemnn 11649	. . . . . . 7 |- ( ( a e. NN /\ b e. NN ) -> ( sqr ` 2 ) # ( a / b ) )
41	38, 39, 40	syl2anc 406	. . . . . 6 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> ( sqr ` 2 ) # ( a / b ) )
42		0z 8917	. . . . . . . . 9 |- 0 e. ZZ
43		zlelttric 8951	. . . . . . . . 9 |- ( ( a e. ZZ /\ 0 e. ZZ ) -> ( a <_ 0 \/ 0 < a ) )
44	42, 43	mpan2 419	. . . . . . . 8 |- ( a e. ZZ -> ( a <_ 0 \/ 0 < a ) )
45	44	ad2antrl 477	. . . . . . 7 |- ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) -> ( a <_ 0 \/ 0 < a ) )
46	45	adantr 272	. . . . . 6 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( a <_ 0 \/ 0 < a ) )
47	34, 41, 46	mpjaodan 753	. . . . 5 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( sqr ` 2 ) # ( a / b ) )
48		simpr 109	. . . . 5 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> Q = ( a / b ) )
49	47, 48	breqtrrd 3901	. . . 4 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( sqr ` 2 ) # Q )
50	49	ex 114	. . 3 |- ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) -> ( Q = ( a / b ) -> ( sqr ` 2 ) # Q ) )
51	50	rexlimdvva 2516	. 2 |- ( Q e. QQ -> ( E. a e. ZZ E. b e. NN Q = ( a / b ) -> ( sqr ` 2 ) # Q ) )
52	2, 51	mpd 13	1 |- ( Q e. QQ -> ( sqr ` 2 ) # Q )

Syntax hints:   -> wi 4   /\ wa 103   \/ wo 670   = wceq 1299   e. wcel 1448   E.wrex 2376   class class class wbr 3875   ` cfv 5059  (class class class)co 5706   RRcr 7499   0cc0 7500   1c1 7501   x. cmul 7505   < clt 7672   <_ cle 7673   # cap 8209   / cdiv 8293   NNcn 8578   2c2 8629   ZZcz 8906   QQcq 9261   sqrcsqrt 10608

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 584  ax-in2 585  ax-io 671  ax-5 1391  ax-7 1392  ax-gen 1393  ax-ie1 1437  ax-ie2 1438  ax-8 1450  ax-10 1451  ax-11 1452  ax-i12 1453  ax-bndl 1454  ax-4 1455  ax-13 1459  ax-14 1460  ax-17 1474  ax-i9 1478  ax-ial 1482  ax-i5r 1483  ax-ext 2082  ax-coll 3983  ax-sep 3986  ax-nul 3994  ax-pow 4038  ax-pr 4069  ax-un 4293  ax-setind 4390  ax-iinf 4440  ax-cnex 7586  ax-resscn 7587  ax-1cn 7588  ax-1re 7589  ax-icn 7590  ax-addcl 7591  ax-addrcl 7592  ax-mulcl 7593  ax-mulrcl 7594  ax-addcom 7595  ax-mulcom 7596  ax-addass 7597  ax-mulass 7598  ax-distr 7599  ax-i2m1 7600  ax-0lt1 7601  ax-1rid 7602  ax-0id 7603  ax-rnegex 7604  ax-precex 7605  ax-cnre 7606  ax-pre-ltirr 7607  ax-pre-ltwlin 7608  ax-pre-lttrn 7609  ax-pre-apti 7610  ax-pre-ltadd 7611  ax-pre-mulgt0 7612  ax-pre-mulext 7613  ax-arch 7614  ax-caucvg 7615

This theorem depends on definitions:  df-bi 116  df-dc 787  df-3or 931  df-3an 932  df-tru 1302  df-fal 1305  df-xor 1322  df-nf 1405  df-sb 1704  df-eu 1963  df-mo 1964  df-clab 2087  df-cleq 2093  df-clel 2096  df-nfc 2229  df-ne 2268  df-nel 2363  df-ral 2380  df-rex 2381  df-reu 2382  df-rmo 2383  df-rab 2384  df-v 2643  df-sbc 2863  df-csb 2956  df-dif 3023  df-un 3025  df-in 3027  df-ss 3034  df-nul 3311  df-if 3422  df-pw 3459  df-sn 3480  df-pr 3481  df-op 3483  df-uni 3684  df-int 3719  df-iun 3762  df-br 3876  df-opab 3930  df-mpt 3931  df-tr 3967  df-id 4153  df-po 4156  df-iso 4157  df-iord 4226  df-on 4228  df-ilim 4229  df-suc 4231  df-iom 4443  df-xp 4483  df-rel 4484  df-cnv 4485  df-co 4486  df-dm 4487  df-rn 4488  df-res 4489  df-ima 4490  df-iota 5024  df-fun 5061  df-fn 5062  df-f 5063  df-f1 5064  df-fo 5065  df-f1o 5066  df-fv 5067  df-riota 5662  df-ov 5709  df-oprab 5710  df-mpo 5711  df-1st 5969  df-2nd 5970  df-recs 6132  df-frec 6218  df-1o 6243  df-2o 6244  df-er 6359  df-en 6565  df-sup 6786  df-pnf 7674  df-mnf 7675  df-xr 7676  df-ltxr 7677  df-le 7678  df-sub 7806  df-neg 7807  df-reap 8203  df-ap 8210  df-div 8294  df-inn 8579  df-2 8637  df-3 8638  df-4 8639  df-n0 8830  df-z 8907  df-uz 9177  df-q 9262  df-rp 9292  df-fz 9632  df-fzo 9761  df-fl 9884  df-mod 9937  df-seqfrec 10060  df-exp 10134  df-cj 10455  df-re 10456  df-im 10457  df-rsqrt 10610  df-abs 10611  df-dvds 11289  df-gcd 11431  df-prm 11582

This theorem is referenced by: (None)