Theorem sqrt2irrap 12907

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 12889. (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 9976	. . 3 |- ( Q e. QQ <-> E. a e. ZZ E. b e. NN Q = ( a / b ) )
2	1	biimpi 120	. 2 |- ( Q e. QQ -> E. a e. ZZ E. b e. NN Q = ( a / b ) )
3		simplrl 537	. . . . . . . . 9 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> a e. ZZ )
4	3	adantr 276	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. ZZ )
5		simplrr 538	. . . . . . . . 9 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> b e. NN )
6	5	adantr 276	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. NN )
7		znq 9978	. . . . . . . . 9 |- ( ( a e. ZZ /\ b e. NN ) -> ( a / b ) e. QQ )
8		qre 9979	. . . . . . . . 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 411	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) e. RR )
11		sqrt2re 12890	. . . . . . . 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 8292	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 e. RR )
14	4	zcnd 9723	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. CC )
15	6	nncnd 9272	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. CC )
16	6	nnap0d 9304	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b # 0 )
17	14, 15, 16	divrecapd 9088	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) = ( a x. ( 1 / b ) ) )
18	4	zred 9722	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. RR )
19	6	nnrecred 9305	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( 1 / b ) e. RR )
20		simpr 110	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a <_ 0 )
21		1red 8306	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 1 e. RR )
22	6	nnrpd 10049	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. RR+ )
23		0le1 8774	. . . . . . . . . . . 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 10092	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 <_ ( 1 / b ) )
26		mulle0r 9239	. . . . . . . . . 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 1275	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a x. ( 1 / b ) ) <_ 0 )
28	17, 27	eqbrtrd 4137	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) <_ 0 )
29		2re 9328	. . . . . . . . . 10 |- 2 e. RR
30		2pos 9349	. . . . . . . . . 10 |- 0 < 2
31	29, 30	sqrtgt0ii 11846	. . . . . . . . 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 8416	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) < ( sqr ` 2 ) )
34	10, 12, 33	gtapd 8930	. . . . . 6 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( sqr ` 2 ) # ( a / b ) )
35	3	adantr 276	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> a e. ZZ )
36		simpr 110	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> 0 < a )
37		elnnz 9608	. . . . . . . 8 |- ( a e. NN <-> ( a e. ZZ /\ 0 < a ) )
38	35, 36, 37	sylanbrc 417	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> a e. NN )
39	5	adantr 276	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> b e. NN )
40		sqrt2irraplemnn 12906	. . . . . . 7 |- ( ( a e. NN /\ b e. NN ) -> ( sqr ` 2 ) # ( a / b ) )
41	38, 39, 40	syl2anc 411	. . . . . 6 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> ( sqr ` 2 ) # ( a / b ) )
42		0z 9609	. . . . . . . . 9 |- 0 e. ZZ
43		zlelttric 9643	. . . . . . . . 9 |- ( ( a e. ZZ /\ 0 e. ZZ ) -> ( a <_ 0 \/ 0 < a ) )
44	42, 43	mpan2 425	. . . . . . . 8 |- ( a e. ZZ -> ( a <_ 0 \/ 0 < a ) )
45	44	ad2antrl 490	. . . . . . 7 |- ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) -> ( a <_ 0 \/ 0 < a ) )
46	45	adantr 276	. . . . . 6 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( a <_ 0 \/ 0 < a ) )
47	34, 41, 46	mpjaodan 806	. . . . 5 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( sqr ` 2 ) # ( a / b ) )
48		simpr 110	. . . . 5 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> Q = ( a / b ) )
49	47, 48	breqtrrd 4143	. . . 4 |- ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) -> ( sqr ` 2 ) # Q )
50	49	ex 115	. . 3 |- ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) -> ( Q = ( a / b ) -> ( sqr ` 2 ) # Q ) )
51	50	rexlimdvva 2670	. 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 104   \/ wo 716   = wceq 1398   e. wcel 2205   E.wrex 2523   class class class wbr 4115   ` cfv 5358  (class class class)co 6059   RRcr 8143   0cc0 8144   1c1 8145   x. cmul 8149   < clt 8325   <_ cle 8326   # cap 8874   / cdiv 8967   NNcn 9258   2c2 9309   ZZcz 9598   QQcq 9973   sqrcsqrt 11711

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 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4231  ax-sep 4234  ax-nul 4242  ax-pow 4293  ax-pr 4328  ax-un 4560  ax-setind 4665  ax-iinf 4716  ax-cnex 8235  ax-resscn 8236  ax-1cn 8237  ax-1re 8238  ax-icn 8239  ax-addcl 8240  ax-addrcl 8241  ax-mulcl 8242  ax-mulrcl 8243  ax-addcom 8244  ax-mulcom 8245  ax-addass 8246  ax-mulass 8247  ax-distr 8248  ax-i2m1 8249  ax-0lt1 8250  ax-1rid 8251  ax-0id 8252  ax-rnegex 8253  ax-precex 8254  ax-cnre 8255  ax-pre-ltirr 8256  ax-pre-ltwlin 8257  ax-pre-lttrn 8258  ax-pre-apti 8259  ax-pre-ltadd 8260  ax-pre-mulgt0 8261  ax-pre-mulext 8262  ax-arch 8263  ax-caucvg 8264

This theorem depends on definitions:  df-bi 117  df-stab 839  df-dc 843  df-3or 1006  df-3an 1007  df-tru 1401  df-fal 1404  df-xor 1421  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ne 2415  df-nel 2510  df-ral 2527  df-rex 2528  df-reu 2529  df-rmo 2530  df-rab 2531  df-v 2817  df-sbc 3046  df-csb 3142  df-dif 3216  df-un 3218  df-in 3220  df-ss 3227  df-nul 3513  df-if 3626  df-pw 3677  df-sn 3701  df-pr 3702  df-op 3704  df-uni 3921  df-int 3956  df-iun 3999  df-br 4116  df-opab 4178  df-mpt 4179  df-tr 4215  df-id 4420  df-po 4423  df-iso 4424  df-iord 4493  df-on 4495  df-ilim 4496  df-suc 4498  df-iom 4719  df-xp 4761  df-rel 4762  df-cnv 4763  df-co 4764  df-dm 4765  df-rn 4766  df-res 4767  df-ima 4768  df-iota 5318  df-fun 5360  df-fn 5361  df-f 5362  df-f1 5363  df-fo 5364  df-f1o 5365  df-fv 5366  df-riota 6012  df-ov 6062  df-oprab 6063  df-mpo 6064  df-1st 6348  df-2nd 6349  df-recs 6550  df-frec 6636  df-1o 6661  df-2o 6662  df-er 6781  df-en 6990  df-sup 7289  df-pnf 8327  df-mnf 8328  df-xr 8329  df-ltxr 8330  df-le 8331  df-sub 8464  df-neg 8465  df-reap 8868  df-ap 8875  df-div 8968  df-inn 9259  df-2 9317  df-3 9318  df-4 9319  df-n0 9518  df-z 9599  df-uz 9876  df-q 9974  df-rp 10009  df-fz 10366  df-fzo 10503  df-fl 10658  df-mod 10713  df-seqfrec 10838  df-exp 10929  df-cj 11556  df-re 11557  df-im 11558  df-rsqrt 11713  df-abs 11714  df-dvds 12504  df-gcd 12680  df-prm 12835

This theorem is referenced by:  2irrexpqap  15974