reeff1o - Metamath Proof Explorer

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Theorem reeff1o 26506

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 16153	. 2 ⊢ (exp ↾ ℝ):ℝ–1-1→ℝ⁺
2		f1f 6805	. . . 4 ⊢ ((exp ↾ ℝ):ℝ–1-1→ℝ⁺ → (exp ↾ ℝ):ℝ⟶ℝ⁺)
3		ffn 6737	. . . 4 ⊢ ((exp ↾ ℝ):ℝ⟶ℝ⁺ → (exp ↾ ℝ) Fn ℝ)
4	1, 2, 3	mp2b 10	. . 3 ⊢ (exp ↾ ℝ) Fn ℝ
5		frn 6744	. . . . 5 ⊢ ((exp ↾ ℝ):ℝ⟶ℝ⁺ → ran (exp ↾ ℝ) ⊆ ℝ⁺)
6	1, 2, 5	mp2b 10	. . . 4 ⊢ ran (exp ↾ ℝ) ⊆ ℝ⁺
7		elrp 13034	. . . . . . . . . . 11 ⊢ (𝑧 ∈ ℝ⁺ ↔ (𝑧 ∈ ℝ ∧ 0 < 𝑧))
8		reclt1 12161	. . . . . . . . . . 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 13041	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ ℝ⁺ → 𝑧 ∈ ℝ)
11		rpne0 13049	. . . . . . . . . . . . . . 15 ⊢ (𝑧 ∈ ℝ⁺ → 𝑧 ≠ 0)
12	10, 11	rereccld 12092	. . . . . . . . . . . . . 14 ⊢ (𝑧 ∈ ℝ⁺ → (1 / 𝑧) ∈ ℝ)
13		reeff1olem 26505	. . . . . . . . . . . . . 14 ⊢ (((1 / 𝑧) ∈ ℝ ∧ 1 < (1 / 𝑧)) → ∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧))
14	12, 13	sylan 580	. . . . . . . . . . . . 13 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < (1 / 𝑧)) → ∃𝑦 ∈ ℝ (exp‘𝑦) = (1 / 𝑧))
15		eqcom 2742	. . . . . . . . . . . . . . . . 17 ⊢ ((1 / 𝑧) = (exp‘𝑦) ↔ (exp‘𝑦) = (1 / 𝑧))
16		rpcnne0 13051	. . . . . . . . . . . . . . . . . . 19 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 ∈ ℂ ∧ 𝑧 ≠ 0))
17		recn 11243	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℝ → 𝑦 ∈ ℂ)
18		efcl 16115	. . . . . . . . . . . . . . . . . . . . 21 ⊢ (𝑦 ∈ ℂ → (exp‘𝑦) ∈ ℂ)
19	17, 18	syl 17	. . . . . . . . . . . . . . . . . . . 20 ⊢ (𝑦 ∈ ℝ → (exp‘𝑦) ∈ ℂ)
20		efne0 16130	. . . . . . . . . . . . . . . . . . . . 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 11964	. . . . . . . . . . . . . . . . . . 19 ⊢ (((𝑧 ∈ ℂ ∧ 𝑧 ≠ 0) ∧ ((exp‘𝑦) ∈ ℂ ∧ (exp‘𝑦) ≠ 0)) → ((1 / 𝑧) = (exp‘𝑦) ↔ (1 / (exp‘𝑦)) = 𝑧))
24	16, 22, 23	syl2an 596	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 𝑦 ∈ ℝ) → ((1 / 𝑧) = (exp‘𝑦) ↔ (1 / (exp‘𝑦)) = 𝑧))
25		efcan 16129	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑦 ∈ ℂ → ((exp‘𝑦) · (exp‘-𝑦)) = 1)
26	25	eqcomd 2741	. . . . . . . . . . . . . . . . . . . . . 22 ⊢ (𝑦 ∈ ℂ → 1 = ((exp‘𝑦) · (exp‘-𝑦)))
27		negcl 11506	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (𝑦 ∈ ℂ → -𝑦 ∈ ℂ)
28		efcl 16115	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ (-𝑦 ∈ ℂ → (exp‘-𝑦) ∈ ℂ)
29	27, 28	syl 17	. . . . . . . . . . . . . . . . . . . . . . 23 ⊢ (𝑦 ∈ ℂ → (exp‘-𝑦) ∈ ℂ)
30		ax-1cn 11211	. . . . . . . . . . . . . . . . . . . . . . . 24 ⊢ 1 ∈ ℂ
31		divmul2 11924	. . . . . . . . . . . . . . . . . . . . . . . 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 1447	. . . . . . . . . . . . . . . . . . . . . . 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 837	. . . . . . . . . . . . . . . . . . . . . 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 2737	. . . . . . . . . . . . . . . . . . 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 3166	. . . . . . . . . . . . . 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 11570	. . . . . . . . . . . . 13 ⊢ (𝑦 ∈ ℝ → -𝑦 ∈ ℝ)
45		infm3lem 12224	. . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℝ → ∃𝑦 ∈ ℝ 𝑥 = -𝑦)
46		fveqeq2 6916	. . . . . . . . . . . . 13 ⊢ (𝑥 = -𝑦 → ((exp‘𝑥) = 𝑧 ↔ (exp‘-𝑦) = 𝑧))
47	44, 45, 46	rexxfr 5422	. . . . . . . . . . . 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 16124	. . . . . . . . . . 11 ⊢ (exp‘0) = 1
53	52	eqeq2i 2748	. . . . . . . . . 10 ⊢ (𝑧 = (exp‘0) ↔ 𝑧 = 1)
54		0re 11261	. . . . . . . . . . . 12 ⊢ 0 ∈ ℝ
55		fveqeq2 6916	. . . . . . . . . . . . 13 ⊢ (𝑥 = 0 → ((exp‘𝑥) = 𝑧 ↔ (exp‘0) = 𝑧))
56	55	rspcev 3622	. . . . . . . . . . . 12 ⊢ ((0 ∈ ℝ ∧ (exp‘0) = 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
57	54, 56	mpan 690	. . . . . . . . . . 11 ⊢ ((exp‘0) = 𝑧 → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
58	57	eqcoms 2743	. . . . . . . . . 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 26505	. . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ 1 < 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
62	10, 61	sylan 580	. . . . . . . 8 ⊢ ((𝑧 ∈ ℝ⁺ ∧ 1 < 𝑧) → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
63		1re 11259	. . . . . . . . 9 ⊢ 1 ∈ ℝ
64		lttri4 11343	. . . . . . . . 9 ⊢ ((𝑧 ∈ ℝ ∧ 1 ∈ ℝ) → (𝑧 < 1 ∨ 𝑧 = 1 ∨ 1 < 𝑧))
65	10, 63, 64	sylancl 586	. . . . . . . 8 ⊢ (𝑧 ∈ ℝ⁺ → (𝑧 < 1 ∨ 𝑧 = 1 ∨ 1 < 𝑧))
66	51, 60, 62, 65	mpjao3dan 1431	. . . . . . 7 ⊢ (𝑧 ∈ ℝ⁺ → ∃𝑥 ∈ ℝ (exp‘𝑥) = 𝑧)
67		fvres 6926	. . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → ((exp ↾ ℝ)‘𝑥) = (exp‘𝑥))
68	67	eqeq1d 2737	. . . . . . . 8 ⊢ (𝑥 ∈ ℝ → (((exp ↾ ℝ)‘𝑥) = 𝑧 ↔ (exp‘𝑥) = 𝑧))
69	68	rexbiia 3090	. . . . . . 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 6969	. . . . . . 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 3999	. . . 4 ⊢ ℝ⁺ ⊆ ran (exp ↾ ℝ)
75	6, 74	eqssi 4012	. . 3 ⊢ ran (exp ↾ ℝ) = ℝ⁺
76		df-fo 6569	. . 3 ⊢ ((exp ↾ ℝ):ℝ–onto→ℝ⁺ ↔ ((exp ↾ ℝ) Fn ℝ ∧ ran (exp ↾ ℝ) = ℝ⁺))
77	4, 75, 76	mpbir2an 711	. 2 ⊢ (exp ↾ ℝ):ℝ–onto→ℝ⁺
78		df-f1o 6570	. 2 ⊢ ((exp ↾ ℝ):ℝ–1-1-onto→ℝ⁺ ↔ ((exp ↾ ℝ):ℝ–1-1→ℝ⁺ ∧ (exp ↾ ℝ):ℝ–onto→ℝ⁺))
79	1, 77, 78	mpbir2an 711	1 ⊢ (exp ↾ ℝ):ℝ–1-1-onto→ℝ⁺

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ w3o 1085 = wceq 1537 ∈ wcel 2106 ≠ wne 2938 ∃wrex 3068 ⊆ wss 3963 class class class wbr 5148 ran crn 5690 ↾ cres 5691 Fn wfn 6558 ⟶wf 6559 –1-1→wf1 6560 –onto→wfo 6561 –1-1-onto→wf1o 6562 ‘cfv 6563 (class class class)co 7431 ℂcc 11151 ℝcr 11152 0cc0 11153 1c1 11154 · cmul 11158 < clt 11293 -cneg 11491 / cdiv 11918 ℝ⁺crp 13032 expce 16094

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-inf2 9679 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230 ax-pre-sup 11231 ax-addf 11232

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-se 5642 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-isom 6572 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-of 7697 df-om 7888 df-1st 8013 df-2nd 8014 df-supp 8185 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-2o 8506 df-er 8744 df-map 8867 df-pm 8868 df-ixp 8937 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-fsupp 9400 df-fi 9449 df-sup 9480 df-inf 9481 df-oi 9548 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-div 11919 df-nn 12265 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12525 df-z 12612 df-dec 12732 df-uz 12877 df-q 12989 df-rp 13033 df-xneg 13152 df-xadd 13153 df-xmul 13154 df-ioo 13388 df-ico 13390 df-icc 13391 df-fz 13545 df-fzo 13692 df-fl 13829 df-seq 14040 df-exp 14100 df-fac 14310 df-bc 14339 df-hash 14367 df-shft 15103 df-cj 15135 df-re 15136 df-im 15137 df-sqrt 15271 df-abs 15272 df-limsup 15504 df-clim 15521 df-rlim 15522 df-sum 15720 df-ef 16100 df-struct 17181 df-sets 17198 df-slot 17216 df-ndx 17228 df-base 17246 df-ress 17275 df-plusg 17311 df-mulr 17312 df-starv 17313 df-sca 17314 df-vsca 17315 df-ip 17316 df-tset 17317 df-ple 17318 df-ds 17320 df-unif 17321 df-hom 17322 df-cco 17323 df-rest 17469 df-topn 17470 df-0g 17488 df-gsum 17489 df-topgen 17490 df-pt 17491 df-prds 17494 df-xrs 17549 df-qtop 17554 df-imas 17555 df-xps 17557 df-mre 17631 df-mrc 17632 df-acs 17634 df-mgm 18666 df-sgrp 18745 df-mnd 18761 df-submnd 18810 df-mulg 19099 df-cntz 19348 df-cmn 19815 df-psmet 21374 df-xmet 21375 df-met 21376 df-bl 21377 df-mopn 21378 df-fbas 21379 df-fg 21380 df-cnfld 21383 df-top 22916 df-topon 22933 df-topsp 22955 df-bases 22969 df-cld 23043 df-ntr 23044 df-cls 23045 df-nei 23122 df-lp 23160 df-perf 23161 df-cn 23251 df-cnp 23252 df-haus 23339 df-tx 23586 df-hmeo 23779 df-fil 23870 df-fm 23962 df-flim 23963 df-flf 23964 df-xms 24346 df-ms 24347 df-tms 24348 df-cncf 24918 df-limc 25916 df-dv 25917

This theorem is referenced by: reefiso 26507 efcvx 26508 reefgim 26509 eff1olem 26605 dfrelog 26622 relogf1o 26623 dvrelog 26694

W3C validator