Theorem sqrt2irrap 12941

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 12923. (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 10005	. . 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 541	. . . . . . . . 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 542	. . . . . . . . 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 10007	. . . . . . . . 9 |- ( ( a e. ZZ /\ b e. NN ) -> ( a / b ) e. QQ )
8		qre 10008	. . . . . . . . 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 415	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) e. RR )
11		sqrt2re 12924	. . . . . . . 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 8321	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 e. RR )
14	4	zcnd 9752	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. CC )
15	6	nncnd 9301	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. CC )
16	6	nnap0d 9333	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b # 0 )
17	14, 15, 16	divrecapd 9117	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) = ( a x. ( 1 / b ) ) )
18	4	zred 9751	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> a e. RR )
19	6	nnrecred 9334	. . . . . . . . . 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 8335	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 1 e. RR )
22	6	nnrpd 10078	. . . . . . . . . . 11 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> b e. RR+ )
23		0le1 8803	. . . . . . . . . . . 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 10121	. . . . . . . . . 10 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> 0 <_ ( 1 / b ) )
26		mulle0r 9268	. . . . . . . . . 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 1279	. . . . . . . . 9 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a x. ( 1 / b ) ) <_ 0 )
28	17, 27	eqbrtrd 4150	. . . . . . . 8 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) <_ 0 )
29		2re 9357	. . . . . . . . . 10 |- 2 e. RR
30		2pos 9378	. . . . . . . . . 10 |- 0 < 2
31	29, 30	sqrtgt0ii 11880	. . . . . . . . 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 8445	. . . . . . 7 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ a <_ 0 ) -> ( a / b ) < ( sqr ` 2 ) )
34	10, 12, 33	gtapd 8959	. . . . . 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 9637	. . . . . . . 8 |- ( a e. NN <-> ( a e. ZZ /\ 0 < a ) )
38	35, 36, 37	sylanbrc 421	. . . . . . 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 12940	. . . . . . 7 |- ( ( a e. NN /\ b e. NN ) -> ( sqr ` 2 ) # ( a / b ) )
41	38, 39, 40	syl2anc 415	. . . . . 6 |- ( ( ( ( Q e. QQ /\ ( a e. ZZ /\ b e. NN ) ) /\ Q = ( a / b ) ) /\ 0 < a ) -> ( sqr ` 2 ) # ( a / b ) )
42		0z 9638	. . . . . . . . 9 |- 0 e. ZZ
43		zlelttric 9672	. . . . . . . . 9 |- ( ( a e. ZZ /\ 0 e. ZZ ) -> ( a <_ 0 \/ 0 < a ) )
44	42, 43	mpan2 429	. . . . . . . 8 |- ( a e. ZZ -> ( a <_ 0 \/ 0 < a ) )
45	44	ad2antrl 494	. . . . . . 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 810	. . . . 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 4156	. . . 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 2676	. 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 720   = wceq 1402   e. wcel 2209   E.wrex 2529   class class class wbr 4128   ` cfv 5375  (class class class)co 6079   RRcr 8172   0cc0 8173   1c1 8174   x. cmul 8178   < clt 8354   <_ cle 8355   # cap 8903   / cdiv 8996   NNcn 9287   2c2 9338   ZZcz 9627   QQcq 10002   sqrcsqrt 11745

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 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-coll 4244  ax-sep 4247  ax-nul 4257  ax-pow 4309  ax-pr 4344  ax-un 4576  ax-setind 4682  ax-iinf 4733  ax-cnex 8264  ax-resscn 8265  ax-1cn 8266  ax-1re 8267  ax-icn 8268  ax-addcl 8269  ax-addrcl 8270  ax-mulcl 8271  ax-mulrcl 8272  ax-addcom 8273  ax-mulcom 8274  ax-addass 8275  ax-mulass 8276  ax-distr 8277  ax-i2m1 8278  ax-0lt1 8279  ax-1rid 8280  ax-0id 8281  ax-rnegex 8282  ax-precex 8283  ax-cnre 8284  ax-pre-ltirr 8285  ax-pre-ltwlin 8286  ax-pre-lttrn 8287  ax-pre-apti 8288  ax-pre-ltadd 8289  ax-pre-mulgt0 8290  ax-pre-mulext 8291  ax-arch 8292  ax-caucvg 8293

This theorem depends on definitions:  df-bi 117  df-stab 843  df-dc 847  df-3or 1010  df-3an 1011  df-tru 1405  df-fal 1408  df-xor 1425  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-nel 2516  df-ral 2533  df-rex 2534  df-reu 2535  df-rmo 2536  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-nul 3521  df-if 3639  df-pw 3690  df-sn 3714  df-pr 3715  df-op 3717  df-uni 3934  df-int 3969  df-iun 4012  df-br 4129  df-opab 4191  df-mpt 4192  df-tr 4228  df-id 4436  df-po 4439  df-iso 4440  df-iord 4509  df-on 4511  df-ilim 4512  df-suc 4514  df-iom 4736  df-xp 4778  df-rel 4779  df-cnv 4780  df-co 4781  df-dm 4782  df-rn 4783  df-res 4784  df-ima 4785  df-iota 5335  df-fun 5377  df-fn 5378  df-f 5379  df-f1 5380  df-fo 5381  df-f1o 5382  df-fv 5383  df-riota 6032  df-ov 6082  df-oprab 6083  df-mpo 6084  df-1st 6368  df-2nd 6369  df-recs 6570  df-frec 6656  df-1o 6681  df-2o 6682  df-er 6801  df-en 7017  df-sup 7318  df-pnf 8356  df-mnf 8357  df-xr 8358  df-ltxr 8359  df-le 8360  df-sub 8493  df-neg 8494  df-reap 8897  df-ap 8904  df-div 8997  df-inn 9288  df-2 9346  df-3 9347  df-4 9348  df-n0 9547  df-z 9628  df-uz 9905  df-q 10003  df-rp 10038  df-fz 10395  df-fzo 10533  df-fl 10688  df-mod 10743  df-seqfrec 10868  df-exp 10959  df-cj 11590  df-re 11591  df-im 11592  df-rsqrt 11747  df-abs 11748  df-dvds 12538  df-gcd 12714  df-prm 12869

This theorem is referenced by:  2irrexpqap  16063