Theorem efltim 11661

Description: The exponential function on the reals is strictly increasing. (Contributed by Paul Chapman, 21-Aug-2007.) (Revised by Jim Kingdon, 20-Dec-2022.)

Assertion

Ref	Expression
efltim	|- ( ( A e. RR /\ B e. RR ) -> ( A < B -> ( exp ` A ) < ( exp ` B ) ) )

Proof of Theorem efltim

Step	Hyp	Ref	Expression
1		simp2 993	. . . . . . 7 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> B e. RR )
2		simp1 992	. . . . . . 7 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> A e. RR )
3	1, 2	resubcld 8300	. . . . . 6 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( B - A ) e. RR )
4		posdif 8374	. . . . . . 7 |- ( ( A e. RR /\ B e. RR ) -> ( A < B <-> 0 < ( B - A ) ) )
5	4	biimp3a 1340	. . . . . 6 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> 0 < ( B - A ) )
6	3, 5	elrpd 9650	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( B - A ) e. RR+ )
7		efgt1 11660	. . . . 5 |- ( ( B - A ) e. RR+ -> 1 < ( exp ` ( B - A ) ) )
8	6, 7	syl 14	. . . 4 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> 1 < ( exp ` ( B - A ) ) )
9	2	reefcld 11632	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` A ) e. RR )
10	3	reefcld 11632	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` ( B - A ) ) e. RR )
11		efgt0 11647	. . . . . 6 |- ( A e. RR -> 0 < ( exp ` A ) )
12	2, 11	syl 14	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> 0 < ( exp ` A ) )
13		ltmulgt11 8780	. . . . 5 |- ( ( ( exp ` A ) e. RR /\ ( exp ` ( B - A ) ) e. RR /\ 0 < ( exp ` A ) ) -> ( 1 < ( exp ` ( B - A ) ) <-> ( exp ` A ) < ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) ) )
14	9, 10, 12, 13	syl3anc 1233	. . . 4 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( 1 < ( exp ` ( B - A ) ) <-> ( exp ` A ) < ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) ) )
15	8, 14	mpbid 146	. . 3 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` A ) < ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) )
16	2	recnd 7948	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> A e. CC )
17	3	recnd 7948	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( B - A ) e. CC )
18		efadd 11638	. . . . 5 |- ( ( A e. CC /\ ( B - A ) e. CC ) -> ( exp ` ( A + ( B - A ) ) ) = ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) )
19	16, 17, 18	syl2anc 409	. . . 4 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` ( A + ( B - A ) ) ) = ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) )
20	1	recnd 7948	. . . . . 6 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> B e. CC )
21	16, 20	pncan3d 8233	. . . . 5 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( A + ( B - A ) ) = B )
22	21	fveq2d 5500	. . . 4 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` ( A + ( B - A ) ) ) = ( exp ` B ) )
23	19, 22	eqtr3d 2205	. . 3 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( ( exp ` A ) x. ( exp ` ( B - A ) ) ) = ( exp ` B ) )
24	15, 23	breqtrd 4015	. 2 |- ( ( A e. RR /\ B e. RR /\ A < B ) -> ( exp ` A ) < ( exp ` B ) )
25	24	3expia 1200	1 |- ( ( A e. RR /\ B e. RR ) -> ( A < B -> ( exp ` A ) < ( exp ` B ) ) )

Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   /\ w3a 973   = wceq 1348   e. wcel 2141   class class class wbr 3989   ` cfv 5198  (class class class)co 5853   CCcc 7772   RRcr 7773   0cc0 7774   1c1 7775   + caddc 7777   x. cmul 7779   < clt 7954   - cmin 8090   RR+crp 9610   expce 11605

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 609  ax-in2 610  ax-io 704  ax-5 1440  ax-7 1441  ax-gen 1442  ax-ie1 1486  ax-ie2 1487  ax-8 1497  ax-10 1498  ax-11 1499  ax-i12 1500  ax-bndl 1502  ax-4 1503  ax-17 1519  ax-i9 1523  ax-ial 1527  ax-i5r 1528  ax-13 2143  ax-14 2144  ax-ext 2152  ax-coll 4104  ax-sep 4107  ax-nul 4115  ax-pow 4160  ax-pr 4194  ax-un 4418  ax-setind 4521  ax-iinf 4572  ax-cnex 7865  ax-resscn 7866  ax-1cn 7867  ax-1re 7868  ax-icn 7869  ax-addcl 7870  ax-addrcl 7871  ax-mulcl 7872  ax-mulrcl 7873  ax-addcom 7874  ax-mulcom 7875  ax-addass 7876  ax-mulass 7877  ax-distr 7878  ax-i2m1 7879  ax-0lt1 7880  ax-1rid 7881  ax-0id 7882  ax-rnegex 7883  ax-precex 7884  ax-cnre 7885  ax-pre-ltirr 7886  ax-pre-ltwlin 7887  ax-pre-lttrn 7888  ax-pre-apti 7889  ax-pre-ltadd 7890  ax-pre-mulgt0 7891  ax-pre-mulext 7892  ax-arch 7893  ax-caucvg 7894

This theorem depends on definitions:  df-bi 116  df-dc 830  df-3or 974  df-3an 975  df-tru 1351  df-fal 1354  df-nf 1454  df-sb 1756  df-eu 2022  df-mo 2023  df-clab 2157  df-cleq 2163  df-clel 2166  df-nfc 2301  df-ne 2341  df-nel 2436  df-ral 2453  df-rex 2454  df-reu 2455  df-rmo 2456  df-rab 2457  df-v 2732  df-sbc 2956  df-csb 3050  df-dif 3123  df-un 3125  df-in 3127  df-ss 3134  df-nul 3415  df-if 3527  df-pw 3568  df-sn 3589  df-pr 3590  df-op 3592  df-uni 3797  df-int 3832  df-iun 3875  df-disj 3967  df-br 3990  df-opab 4051  df-mpt 4052  df-tr 4088  df-id 4278  df-po 4281  df-iso 4282  df-iord 4351  df-on 4353  df-ilim 4354  df-suc 4356  df-iom 4575  df-xp 4617  df-rel 4618  df-cnv 4619  df-co 4620  df-dm 4621  df-rn 4622  df-res 4623  df-ima 4624  df-iota 5160  df-fun 5200  df-fn 5201  df-f 5202  df-f1 5203  df-fo 5204  df-f1o 5205  df-fv 5206  df-isom 5207  df-riota 5809  df-ov 5856  df-oprab 5857  df-mpo 5858  df-1st 6119  df-2nd 6120  df-recs 6284  df-irdg 6349  df-frec 6370  df-1o 6395  df-oadd 6399  df-er 6513  df-en 6719  df-dom 6720  df-fin 6721  df-sup 6961  df-pnf 7956  df-mnf 7957  df-xr 7958  df-ltxr 7959  df-le 7960  df-sub 8092  df-neg 8093  df-reap 8494  df-ap 8501  df-div 8590  df-inn 8879  df-2 8937  df-3 8938  df-4 8939  df-n0 9136  df-z 9213  df-uz 9488  df-q 9579  df-rp 9611  df-ico 9851  df-fz 9966  df-fzo 10099  df-seqfrec 10402  df-exp 10476  df-fac 10660  df-bc 10682  df-ihash 10710  df-cj 10806  df-re 10807  df-im 10808  df-rsqrt 10962  df-abs 10963  df-clim 11242  df-sumdc 11317  df-ef 11611

This theorem is referenced by:  reef11  11662  reeff1olem  13486  efltlemlt  13489  eflt  13490