reeff1o - Metamath Proof Explorer

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Theorem reeff1o 26509

Description: The real exponential function is one-to-one onto. (Contributed by Paul Chapman, 18-Oct-2007.) (Revised by Mario Carneiro, 10-Nov-2013.)

**Assertion**
Ref	Expression
reeff1o	⊢ (exp ↾ ℝ):ℝ–1-1-onto→ℝ⁺

Proof of Theorem reeff1o Dummy variables 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		reeff1 16168	. 2 ⊢ (exp ↾ ℝ):ℝ–1-1→ℝ⁺
2		f1f 6817	. . . 4 ⊢ ((exp ↾ ℝ):ℝ–1-1→ℝ⁺ → (exp ↾ ℝ):ℝ⟶ℝ⁺)
3		ffn 6747	. . . 4 ⊢ ((exp ↾ ℝ):ℝ⟶ℝ⁺ → (exp ↾ ℝ) Fn ℝ)
4	1, 2, 3	mp2b 10	. . 3 ⊢ (exp ↾ ℝ) Fn ℝ
5		frn 6754	. . . . 5 ⊢ ((exp ↾ ℝ):ℝ⟶ℝ⁺ → ran (exp ↾ ℝ) ⊆ ℝ⁺)
6	1, 2, 5	mp2b 10	. . . 4 ⊢ ran (exp ↾ ℝ) ⊆ ℝ⁺
7		elrp 13059	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℝ⁺ ↔ (𝑧 ∈ ℝ ∧ 0 < 𝑧))
8		reclt1 12190	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ ℝ ∧ 0 < 𝑧) → (𝑧 < 1 ↔ 1 < (1 / 𝑧)))
9	7, 8	sylbi 217	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 < 1 ↔ 1 < (1 / 𝑧)))
10		rpre 13065	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ ℝ⁺ → 𝑧 ∈ ℝ)
11		rpne0 13073	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ ℝ⁺ → 𝑧 ≠ 0)
12	10, 11	rereccld 12121	. . . . . . . . . . . . . 14 ⊢ (𝑧 ∈ ℝ⁺ → (1 / 𝑧) ∈ ℝ)
13		reeff1olem 26508	. . . . . . . . . . . . . 14 ⊢ (((1 / 𝑧) ∈ ℝ ∧ 1 < (1 / 𝑧)) → ∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧))
14	12, 13	sylan 579	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < (1 / 𝑧)) → ∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧))
15		eqcom 2747	. . . . . . . . . . . . . . . . 17 ⊢ ((1 / 𝑧) = (exp‘𝑦) ↔ (exp‘𝑦) = (1 / 𝑧))
16		rpcnne0 13075	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 ∈ ℂ ∧ 𝑧 ≠ 0))
17		recn 11274	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℝ → 𝑦 ∈ ℂ)
18		efcl 16130	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℂ → (exp‘𝑦) ∈ ℂ)
19	17, 18	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ → (exp‘𝑦) ∈ ℂ)
20		efne0 16145	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℂ → (exp‘𝑦) ≠ 0)
21	17, 20	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ → (exp‘𝑦) ≠ 0)
22	19, 21	jca 511	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 ∈ ℝ → ((exp‘𝑦) ∈ ℂ ∧ (exp‘𝑦) ≠ 0))
23		rec11r 11993	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑧 ∈ ℂ ∧ 𝑧 ≠ 0) ∧ ((exp‘𝑦) ∈ ℂ ∧ (exp‘𝑦) ≠ 0)) → ((1 / 𝑧) = (exp‘𝑦) ↔ (1 / (exp‘𝑦)) = 𝑧))
24	16, 22, 23	syl2an 595	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((1 / 𝑧) = (exp‘𝑦) ↔ (1 / (exp‘𝑦)) = 𝑧))
25		efcan 16144	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑦 ∈ ℂ → ((exp‘𝑦) · (exp‘-𝑦)) = 1)
26	25	eqcomd 2746	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 ∈ ℂ → 1 = ((exp‘𝑦) · (exp‘-𝑦)))
27		negcl 11536	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑦 ∈ ℂ → -𝑦 ∈ ℂ)
28		efcl 16130	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (-𝑦 ∈ ℂ → (exp‘-𝑦) ∈ ℂ)
29	27, 28	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑦 ∈ ℂ → (exp‘-𝑦) ∈ ℂ)
30		ax-1cn 11242	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 1 ∈ ℂ
31		divmul2 11953	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ ((1 ∈ ℂ ∧ (exp‘-𝑦) ∈ ℂ ∧ ((exp‘𝑦) ∈ ℂ ∧ (exp‘𝑦) ≠ 0)) → ((1 / (exp‘𝑦)) = (exp‘-𝑦) ↔ 1 = ((exp‘𝑦) · (exp‘-𝑦))))
32	30, 31	mp3an1 1448	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (((exp‘-𝑦) ∈ ℂ ∧ ((exp‘𝑦) ∈ ℂ ∧ (exp‘𝑦) ≠ 0)) → ((1 / (exp‘𝑦)) = (exp‘-𝑦) ↔ 1 = ((exp‘𝑦) · (exp‘-𝑦))))
33	29, 18, 20, 32	syl12anc 836	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 ∈ ℂ → ((1 / (exp‘𝑦)) = (exp‘-𝑦) ↔ 1 = ((exp‘𝑦) · (exp‘-𝑦))))
34	26, 33	mpbird 257	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℂ → (1 / (exp‘𝑦)) = (exp‘-𝑦))
35	17, 34	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ → (1 / (exp‘𝑦)) = (exp‘-𝑦))
36	35	eqeq1d 2742	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑦 ∈ ℝ → ((1 / (exp‘𝑦)) = 𝑧 ↔ (exp‘-𝑦) = 𝑧))
37	36	adantl 481	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((1 / (exp‘𝑦)) = 𝑧 ↔ (exp‘-𝑦) = 𝑧))
38	24, 37	bitrd 279	. . . . . . . . . . . . . . . . 17 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((1 / 𝑧) = (exp‘𝑦) ↔ (exp‘-𝑦) = 𝑧))
39	15, 38	bitr3id 285	. . . . . . . . . . . . . . . 16 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((exp‘𝑦) = (1 / 𝑧) ↔ (exp‘-𝑦) = 𝑧))
40	39	biimpd 229	. . . . . . . . . . . . . . 15 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((exp‘𝑦) = (1 / 𝑧) → (exp‘-𝑦) = 𝑧))
41	40	reximdva 3174	. . . . . . . . . . . . . 14 ⊢ (𝑧 ∈ ℝ⁺ → (∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧) → ∃𝑦 ∈ ℝ (exp‘-𝑦) = 𝑧))
42	41	adantr 480	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < (1 / 𝑧)) → (∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧) → ∃𝑦 ∈ ℝ (exp‘-𝑦) = 𝑧))
43	14, 42	mpd 15	. . . . . . . . . . . 12 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < (1 / 𝑧)) → ∃𝑦 ∈ ℝ (exp‘-𝑦) = 𝑧)
44		renegcl 11599	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ ℝ → -𝑦 ∈ ℝ)
45		infm3lem 12253	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℝ → ∃𝑦 ∈ ℝ 𝑥 = -𝑦)
46		fveqeq2 6929	. . . . . . . . . . . . 13 ⊢ (𝑥 = -𝑦 → ((exp‘𝑥) = 𝑧 ↔ (exp‘-𝑦) = 𝑧))
47	44, 45, 46	rexxfr 5434	. . . . . . . . . . . 12 ⊢ (∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧 ↔ ∃𝑦 ∈ ℝ (exp‘-𝑦) = 𝑧)
48	43, 47	sylibr 234	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < (1 / 𝑧)) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
49	48	ex 412	. . . . . . . . . 10 ⊢ (𝑧 ∈ ℝ⁺ → (1 < (1 / 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧))
50	9, 49	sylbid 240	. . . . . . . . 9 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 < 1 → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧))
51	50	imp 406	. . . . . . . 8 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑧 < 1) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
52		ef0 16139	. . . . . . . . . . 11 ⊢ (exp‘0) = 1
53	52	eqeq2i 2753	. . . . . . . . . 10 ⊢ (𝑧 = (exp‘0) ↔ 𝑧 = 1)
54		0re 11292	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
55		fveqeq2 6929	. . . . . . . . . . . . 13 ⊢ (𝑥 = 0 → ((exp‘𝑥) = 𝑧 ↔ (exp‘0) = 𝑧))
56	55	rspcev 3635	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ (exp‘0) = 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
57	54, 56	mpan 689	. . . . . . . . . . 11 ⊢ ((exp‘0) = 𝑧 → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
58	57	eqcoms 2748	. . . . . . . . . 10 ⊢ (𝑧 = (exp‘0) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
59	53, 58	sylbir 235	. . . . . . . . 9 ⊢ (𝑧 = 1 → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
60	59	adantl 481	. . . . . . . 8 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑧 = 1) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
61		reeff1olem 26508	. . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ 1 < 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
62	10, 61	sylan 579	. . . . . . . 8 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
63		1re 11290	. . . . . . . . 9 ⊢ 1 ∈ ℝ
64		lttri4 11374	. . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ 1 ∈ ℝ) → (𝑧 < 1 ∨ 𝑧 = 1 ∨ 1 < 𝑧))
65	10, 63, 64	sylancl 585	. . . . . . . 8 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 < 1 ∨ 𝑧 = 1 ∨ 1 < 𝑧))
66	51, 60, 62, 65	mpjao3dan 1432	. . . . . . 7 ⊢ (𝑧 ∈ ℝ⁺ → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
67		fvres 6939	. . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → ((exp ↾ ℝ)‘𝑥) = (exp‘𝑥))
68	67	eqeq1d 2742	. . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (((exp ↾ ℝ)‘𝑥) = 𝑧 ↔ (exp‘𝑥) = 𝑧))
69	68	rexbiia 3098	. . . . . . 7 ⊢ (∃𝑥 ∈ ℝ ((exp ↾ ℝ)‘𝑥) = 𝑧 ↔ ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
70	66, 69	sylibr 234	. . . . . 6 ⊢ (𝑧 ∈ ℝ⁺ → ∃𝑥 ∈ ℝ ((exp ↾ ℝ)‘𝑥) = 𝑧)
71		fvelrnb 6982	. . . . . . 7 ⊢ ((exp ↾ ℝ) Fn ℝ → (𝑧 ∈ ran (exp ↾ ℝ) ↔ ∃𝑥 ∈ ℝ ((exp ↾ ℝ)‘𝑥) = 𝑧))
72	4, 71	ax-mp 5	. . . . . 6 ⊢ (𝑧 ∈ ran (exp ↾ ℝ) ↔ ∃𝑥 ∈ ℝ ((exp ↾ ℝ)‘𝑥) = 𝑧)
73	70, 72	sylibr 234	. . . . 5 ⊢ (𝑧 ∈ ℝ⁺ → 𝑧 ∈ ran (exp ↾ ℝ))
74	73	ssriv 4012	. . . 4 ⊢ ℝ⁺ ⊆ ran (exp ↾ ℝ)
75	6, 74	eqssi 4025	. . 3 ⊢ ran (exp ↾ ℝ) = ℝ⁺
76		df-fo 6579	. . 3 ⊢ ((exp ↾ ℝ):ℝ–onto→ℝ⁺ ↔ ((exp ↾ ℝ) Fn ℝ ∧ ran (exp ↾ ℝ) = ℝ⁺))
77	4, 75, 76	mpbir2an 710	. 2 ⊢ (exp ↾ ℝ):ℝ–onto→ℝ⁺
78		df-f1o 6580	. 2 ⊢ ((exp ↾ ℝ):ℝ–1-1-onto→ℝ⁺ ↔ ((exp ↾ ℝ):ℝ–1-1→ℝ⁺ ∧ (exp ↾ ℝ):ℝ–onto→ℝ⁺))
79	1, 77, 78	mpbir2an 710	1 ⊢ (exp ↾ ℝ):ℝ–1-1-onto→ℝ⁺

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ w3o 1086 = wceq 1537 ∈ wcel 2108 ≠ wne 2946 ∃wrex 3076 ⊆ wss 3976 class class class wbr 5166 ran crn 5701 ↾ cres 5702 Fn wfn 6568 ⟶wf 6569 –1-1→wf1 6570 –onto→wfo 6571 –1-1-onto→wf1o 6572 ‘cfv 6573 (class class class)co 7448 ℂcc 11182 ℝcr 11183 0cc0 11184 1c1 11185 · cmul 11189 < clt 11324 -cneg 11521 / cdiv 11947 ℝ⁺crp 13057 expce 16109

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-rep 5303 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 ax-inf2 9710 ax-cnex 11240 ax-resscn 11241 ax-1cn 11242 ax-icn 11243 ax-addcl 11244 ax-addrcl 11245 ax-mulcl 11246 ax-mulrcl 11247 ax-mulcom 11248 ax-addass 11249 ax-mulass 11250 ax-distr 11251 ax-i2m1 11252 ax-1ne0 11253 ax-1rid 11254 ax-rnegex 11255 ax-rrecex 11256 ax-cnre 11257 ax-pre-lttri 11258 ax-pre-lttrn 11259 ax-pre-ltadd 11260 ax-pre-mulgt0 11261 ax-pre-sup 11262 ax-addf 11263

This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3or 1088 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-nel 3053 df-ral 3068 df-rex 3077 df-rmo 3388 df-reu 3389 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-pss 3996 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-tp 4653 df-op 4655 df-uni 4932 df-int 4971 df-iun 5017 df-iin 5018 df-br 5167 df-opab 5229 df-mpt 5250 df-tr 5284 df-id 5593 df-eprel 5599 df-po 5607 df-so 5608 df-fr 5652 df-se 5653 df-we 5654 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-pred 6332 df-ord 6398 df-on 6399 df-lim 6400 df-suc 6401 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-isom 6582 df-riota 7404 df-ov 7451 df-oprab 7452 df-mpo 7453 df-of 7714 df-om 7904 df-1st 8030 df-2nd 8031 df-supp 8202 df-frecs 8322 df-wrecs 8353 df-recs 8427 df-rdg 8466 df-1o 8522 df-2o 8523 df-er 8763 df-map 8886 df-pm 8887 df-ixp 8956 df-en 9004 df-dom 9005 df-sdom 9006 df-fin 9007 df-fsupp 9432 df-fi 9480 df-sup 9511 df-inf 9512 df-oi 9579 df-card 10008 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330 df-sub 11522 df-neg 11523 df-div 11948 df-nn 12294 df-2 12356 df-3 12357 df-4 12358 df-5 12359 df-6 12360 df-7 12361 df-8 12362 df-9 12363 df-n0 12554 df-z 12640 df-dec 12759 df-uz 12904 df-q 13014 df-rp 13058 df-xneg 13175 df-xadd 13176 df-xmul 13177 df-ioo 13411 df-ico 13413 df-icc 13414 df-fz 13568 df-fzo 13712 df-fl 13843 df-seq 14053 df-exp 14113 df-fac 14323 df-bc 14352 df-hash 14380 df-shft 15116 df-cj 15148 df-re 15149 df-im 15150 df-sqrt 15284 df-abs 15285 df-limsup 15517 df-clim 15534 df-rlim 15535 df-sum 15735 df-ef 16115 df-struct 17194 df-sets 17211 df-slot 17229 df-ndx 17241 df-base 17259 df-ress 17288 df-plusg 17324 df-mulr 17325 df-starv 17326 df-sca 17327 df-vsca 17328 df-ip 17329 df-tset 17330 df-ple 17331 df-ds 17333 df-unif 17334 df-hom 17335 df-cco 17336 df-rest 17482 df-topn 17483 df-0g 17501 df-gsum 17502 df-topgen 17503 df-pt 17504 df-prds 17507 df-xrs 17562 df-qtop 17567 df-imas 17568 df-xps 17570 df-mre 17644 df-mrc 17645 df-acs 17647 df-mgm 18678 df-sgrp 18757 df-mnd 18773 df-submnd 18819 df-mulg 19108 df-cntz 19357 df-cmn 19824 df-psmet 21379 df-xmet 21380 df-met 21381 df-bl 21382 df-mopn 21383 df-fbas 21384 df-fg 21385 df-cnfld 21388 df-top 22921 df-topon 22938 df-topsp 22960 df-bases 22974 df-cld 23048 df-ntr 23049 df-cls 23050 df-nei 23127 df-lp 23165 df-perf 23166 df-cn 23256 df-cnp 23257 df-haus 23344 df-tx 23591 df-hmeo 23784 df-fil 23875 df-fm 23967 df-flim 23968 df-flf 23969 df-xms 24351 df-ms 24352 df-tms 24353 df-cncf 24923 df-limc 25921 df-dv 25922

This theorem is referenced by: reefiso 26510 efcvx 26511 reefgim 26512 eff1olem 26608 dfrelog 26625 relogf1o 26626 dvrelog 26697

W3C validator