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Theorem supminfxr2 42095
Description: The extended real suprema of a set of extended reals is the extended real negative of the extended real infima of that set's image under extended real negation. (Contributed by Glauco Siliprandi, 2-Jan-2022.)
Hypothesis
Ref Expression
supminfxr2.1 (𝜑𝐴 ⊆ ℝ*)
Assertion
Ref Expression
supminfxr2 (𝜑 → sup(𝐴, ℝ*, < ) = -𝑒inf({𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}, ℝ*, < ))
Distinct variable group:   𝑥,𝐴
Allowed substitution hint:   𝜑(𝑥)

Proof of Theorem supminfxr2
Dummy variable 𝑦 is distinct from all other variables.
StepHypRef Expression
1 xnegmnf 12595 . . . . . 6 -𝑒-∞ = +∞
21eqcomi 2810 . . . . 5 +∞ = -𝑒-∞
32a1i 11 . . . 4 ((𝜑 ∧ +∞ ∈ 𝐴) → +∞ = -𝑒-∞)
4 supminfxr2.1 . . . . 5 (𝜑𝐴 ⊆ ℝ*)
5 supxrpnf 12703 . . . . 5 ((𝐴 ⊆ ℝ* ∧ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = +∞)
64, 5sylan 583 . . . 4 ((𝜑 ∧ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = +∞)
7 ssrab2 4010 . . . . . . . 8 {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ⊆ ℝ*
87a1i 11 . . . . . . 7 (+∞ ∈ 𝐴 → {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ⊆ ℝ*)
9 xnegeq 12592 . . . . . . . . . 10 (𝑦 = -∞ → -𝑒𝑦 = -𝑒-∞)
101a1i 11 . . . . . . . . . 10 (𝑦 = -∞ → -𝑒-∞ = +∞)
119, 10eqtrd 2836 . . . . . . . . 9 (𝑦 = -∞ → -𝑒𝑦 = +∞)
1211eleq1d 2877 . . . . . . . 8 (𝑦 = -∞ → (-𝑒𝑦𝐴 ↔ +∞ ∈ 𝐴))
13 mnfxr 10691 . . . . . . . . 9 -∞ ∈ ℝ*
1413a1i 11 . . . . . . . 8 (+∞ ∈ 𝐴 → -∞ ∈ ℝ*)
15 id 22 . . . . . . . 8 (+∞ ∈ 𝐴 → +∞ ∈ 𝐴)
1612, 14, 15elrabd 3633 . . . . . . 7 (+∞ ∈ 𝐴 → -∞ ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴})
17 infxrmnf 12722 . . . . . . 7 (({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ⊆ ℝ* ∧ -∞ ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}) → inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -∞)
188, 16, 17syl2anc 587 . . . . . 6 (+∞ ∈ 𝐴 → inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -∞)
1918adantl 485 . . . . 5 ((𝜑 ∧ +∞ ∈ 𝐴) → inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -∞)
2019xnegeqd 42061 . . . 4 ((𝜑 ∧ +∞ ∈ 𝐴) → -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -𝑒-∞)
213, 6, 203eqtr4d 2846 . . 3 ((𝜑 ∧ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ))
224ssdifssd 4073 . . . . . . 7 (𝜑 → (𝐴 ∖ {-∞}) ⊆ ℝ*)
2322adantr 484 . . . . . 6 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → (𝐴 ∖ {-∞}) ⊆ ℝ*)
24 difssd 4063 . . . . . . . 8 (¬ +∞ ∈ 𝐴 → (𝐴 ∖ {-∞}) ⊆ 𝐴)
25 id 22 . . . . . . . 8 (¬ +∞ ∈ 𝐴 → ¬ +∞ ∈ 𝐴)
26 ssnel 41661 . . . . . . . 8 (((𝐴 ∖ {-∞}) ⊆ 𝐴 ∧ ¬ +∞ ∈ 𝐴) → ¬ +∞ ∈ (𝐴 ∖ {-∞}))
2724, 25, 26syl2anc 587 . . . . . . 7 (¬ +∞ ∈ 𝐴 → ¬ +∞ ∈ (𝐴 ∖ {-∞}))
2827adantl 485 . . . . . 6 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → ¬ +∞ ∈ (𝐴 ∖ {-∞}))
29 neldifsnd 4689 . . . . . 6 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → ¬ -∞ ∈ (𝐴 ∖ {-∞}))
3023, 28, 29xrssre 41967 . . . . 5 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → (𝐴 ∖ {-∞}) ⊆ ℝ)
3130supminfxr 42090 . . . 4 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → sup((𝐴 ∖ {-∞}), ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})}, ℝ*, < ))
32 supxrmnf2 42057 . . . . . . 7 (𝐴 ⊆ ℝ* → sup((𝐴 ∖ {-∞}), ℝ*, < ) = sup(𝐴, ℝ*, < ))
334, 32syl 17 . . . . . 6 (𝜑 → sup((𝐴 ∖ {-∞}), ℝ*, < ) = sup(𝐴, ℝ*, < ))
3433eqcomd 2807 . . . . 5 (𝜑 → sup(𝐴, ℝ*, < ) = sup((𝐴 ∖ {-∞}), ℝ*, < ))
3534adantr 484 . . . 4 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = sup((𝐴 ∖ {-∞}), ℝ*, < ))
36 rexr 10680 . . . . . . . . . . . . . . . . 17 (𝑦 ∈ ℝ → 𝑦 ∈ ℝ*)
3736adantr 484 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → 𝑦 ∈ ℝ*)
38 simpl 486 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → 𝑦 ∈ ℝ)
3938rexnegd 41767 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → -𝑒𝑦 = -𝑦)
40 eldifi 4057 . . . . . . . . . . . . . . . . . 18 (-𝑦 ∈ (𝐴 ∖ {-∞}) → -𝑦𝐴)
4140adantl 485 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → -𝑦𝐴)
4239, 41eqeltrd 2893 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → -𝑒𝑦𝐴)
4337, 42jca 515 . . . . . . . . . . . . . . 15 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → (𝑦 ∈ ℝ* ∧ -𝑒𝑦𝐴))
44 rabid 3334 . . . . . . . . . . . . . . 15 (𝑦 ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ↔ (𝑦 ∈ ℝ* ∧ -𝑒𝑦𝐴))
4543, 44sylibr 237 . . . . . . . . . . . . . 14 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → 𝑦 ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴})
46 renepnf 10682 . . . . . . . . . . . . . . . 16 (𝑦 ∈ ℝ → 𝑦 ≠ +∞)
47 elsni 4545 . . . . . . . . . . . . . . . . 17 (𝑦 ∈ {+∞} → 𝑦 = +∞)
4847necon3ai 3015 . . . . . . . . . . . . . . . 16 (𝑦 ≠ +∞ → ¬ 𝑦 ∈ {+∞})
4946, 48syl 17 . . . . . . . . . . . . . . 15 (𝑦 ∈ ℝ → ¬ 𝑦 ∈ {+∞})
5038, 49syl 17 . . . . . . . . . . . . . 14 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → ¬ 𝑦 ∈ {+∞})
5145, 50eldifd 3895 . . . . . . . . . . . . 13 ((𝑦 ∈ ℝ ∧ -𝑦 ∈ (𝐴 ∖ {-∞})) → 𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}))
5251ex 416 . . . . . . . . . . . 12 (𝑦 ∈ ℝ → (-𝑦 ∈ (𝐴 ∖ {-∞}) → 𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})))
5352rgen 3119 . . . . . . . . . . 11 𝑦 ∈ ℝ (-𝑦 ∈ (𝐴 ∖ {-∞}) → 𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}))
5453a1i 11 . . . . . . . . . 10 (¬ +∞ ∈ 𝐴 → ∀𝑦 ∈ ℝ (-𝑦 ∈ (𝐴 ∖ {-∞}) → 𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})))
55 nfrab1 3340 . . . . . . . . . . . 12 𝑦{𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}
56 nfcv 2958 . . . . . . . . . . . 12 𝑦{+∞}
5755, 56nfdif 4056 . . . . . . . . . . 11 𝑦({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})
5857rabssf 41741 . . . . . . . . . 10 ({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})} ⊆ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ↔ ∀𝑦 ∈ ℝ (-𝑦 ∈ (𝐴 ∖ {-∞}) → 𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})))
5954, 58sylibr 237 . . . . . . . . 9 (¬ +∞ ∈ 𝐴 → {𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})} ⊆ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}))
60 nfv 1915 . . . . . . . . . . . 12 𝑦 ¬ +∞ ∈ 𝐴
61 nfcv 2958 . . . . . . . . . . . 12 𝑦
62 eldifi 4057 . . . . . . . . . . . . . . 15 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → 𝑦 ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴})
637, 62sseldi 3916 . . . . . . . . . . . . . 14 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → 𝑦 ∈ ℝ*)
6463adantl 485 . . . . . . . . . . . . 13 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → 𝑦 ∈ ℝ*)
6544simprbi 500 . . . . . . . . . . . . . . 15 (𝑦 ∈ {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} → -𝑒𝑦𝐴)
6662, 65syl 17 . . . . . . . . . . . . . 14 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → -𝑒𝑦𝐴)
6712biimpac 482 . . . . . . . . . . . . . . . . 17 ((-𝑒𝑦𝐴𝑦 = -∞) → +∞ ∈ 𝐴)
6867adantll 713 . . . . . . . . . . . . . . . 16 (((¬ +∞ ∈ 𝐴 ∧ -𝑒𝑦𝐴) ∧ 𝑦 = -∞) → +∞ ∈ 𝐴)
69 simpll 766 . . . . . . . . . . . . . . . 16 (((¬ +∞ ∈ 𝐴 ∧ -𝑒𝑦𝐴) ∧ 𝑦 = -∞) → ¬ +∞ ∈ 𝐴)
7068, 69pm2.65da 816 . . . . . . . . . . . . . . 15 ((¬ +∞ ∈ 𝐴 ∧ -𝑒𝑦𝐴) → ¬ 𝑦 = -∞)
7170neqned 2997 . . . . . . . . . . . . . 14 ((¬ +∞ ∈ 𝐴 ∧ -𝑒𝑦𝐴) → 𝑦 ≠ -∞)
7266, 71sylan2 595 . . . . . . . . . . . . 13 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → 𝑦 ≠ -∞)
73 eldifsni 4686 . . . . . . . . . . . . . 14 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → 𝑦 ≠ +∞)
7473adantl 485 . . . . . . . . . . . . 13 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → 𝑦 ≠ +∞)
7564, 72, 74xrred 41984 . . . . . . . . . . . 12 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → 𝑦 ∈ ℝ)
7660, 57, 61, 75ssdf2 41765 . . . . . . . . . . 11 (¬ +∞ ∈ 𝐴 → ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ⊆ ℝ)
7775rexnegd 41767 . . . . . . . . . . . . 13 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → -𝑒𝑦 = -𝑦)
7866adantl 485 . . . . . . . . . . . . . 14 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → -𝑒𝑦𝐴)
7963adantr 484 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ∧ -𝑒𝑦 ∈ {-∞}) → 𝑦 ∈ ℝ*)
80 elsni 4545 . . . . . . . . . . . . . . . . . 18 (-𝑒𝑦 ∈ {-∞} → -𝑒𝑦 = -∞)
8180adantl 485 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ∧ -𝑒𝑦 ∈ {-∞}) → -𝑒𝑦 = -∞)
82 xnegeq 12592 . . . . . . . . . . . . . . . . . . . 20 (-𝑒𝑦 = -∞ → -𝑒-𝑒𝑦 = -𝑒-∞)
831a1i 11 . . . . . . . . . . . . . . . . . . . 20 (-𝑒𝑦 = -∞ → -𝑒-∞ = +∞)
8482, 83eqtr2d 2837 . . . . . . . . . . . . . . . . . . 19 (-𝑒𝑦 = -∞ → +∞ = -𝑒-𝑒𝑦)
8584adantl 485 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ ℝ* ∧ -𝑒𝑦 = -∞) → +∞ = -𝑒-𝑒𝑦)
86 xnegneg 12599 . . . . . . . . . . . . . . . . . . 19 (𝑦 ∈ ℝ* → -𝑒-𝑒𝑦 = 𝑦)
8786adantr 484 . . . . . . . . . . . . . . . . . 18 ((𝑦 ∈ ℝ* ∧ -𝑒𝑦 = -∞) → -𝑒-𝑒𝑦 = 𝑦)
8885, 87eqtr2d 2837 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ ℝ* ∧ -𝑒𝑦 = -∞) → 𝑦 = +∞)
8979, 81, 88syl2anc 587 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ∧ -𝑒𝑦 ∈ {-∞}) → 𝑦 = +∞)
9073neneqd 2995 . . . . . . . . . . . . . . . . 17 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → ¬ 𝑦 = +∞)
9190adantr 484 . . . . . . . . . . . . . . . 16 ((𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ∧ -𝑒𝑦 ∈ {-∞}) → ¬ 𝑦 = +∞)
9289, 91pm2.65da 816 . . . . . . . . . . . . . . 15 (𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) → ¬ -𝑒𝑦 ∈ {-∞})
9392adantl 485 . . . . . . . . . . . . . 14 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → ¬ -𝑒𝑦 ∈ {-∞})
9478, 93eldifd 3895 . . . . . . . . . . . . 13 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → -𝑒𝑦 ∈ (𝐴 ∖ {-∞}))
9577, 94eqeltrrd 2894 . . . . . . . . . . . 12 ((¬ +∞ ∈ 𝐴𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})) → -𝑦 ∈ (𝐴 ∖ {-∞}))
9695ralrimiva 3152 . . . . . . . . . . 11 (¬ +∞ ∈ 𝐴 → ∀𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})-𝑦 ∈ (𝐴 ∖ {-∞}))
9776, 96jca 515 . . . . . . . . . 10 (¬ +∞ ∈ 𝐴 → (({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ⊆ ℝ ∧ ∀𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})-𝑦 ∈ (𝐴 ∖ {-∞})))
9857, 61ssrabf 41737 . . . . . . . . . 10 (({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ⊆ {𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})} ↔ (({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ⊆ ℝ ∧ ∀𝑦 ∈ ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞})-𝑦 ∈ (𝐴 ∖ {-∞})))
9997, 98sylibr 237 . . . . . . . . 9 (¬ +∞ ∈ 𝐴 → ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}) ⊆ {𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})})
10059, 99eqssd 3935 . . . . . . . 8 (¬ +∞ ∈ 𝐴 → {𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})} = ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}))
101100infeq1d 8929 . . . . . . 7 (¬ +∞ ∈ 𝐴 → inf({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})}, ℝ*, < ) = inf(({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}), ℝ*, < ))
102 infxrpnf2 42089 . . . . . . . . 9 ({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ⊆ ℝ* → inf(({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}), ℝ*, < ) = inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ))
1037, 102ax-mp 5 . . . . . . . 8 inf(({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}), ℝ*, < ) = inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < )
104103a1i 11 . . . . . . 7 (¬ +∞ ∈ 𝐴 → inf(({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} ∖ {+∞}), ℝ*, < ) = inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ))
105101, 104eqtr2d 2837 . . . . . 6 (¬ +∞ ∈ 𝐴 → inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = inf({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})}, ℝ*, < ))
106105xnegeqd 42061 . . . . 5 (¬ +∞ ∈ 𝐴 → -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})}, ℝ*, < ))
107106adantl 485 . . . 4 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ ∣ -𝑦 ∈ (𝐴 ∖ {-∞})}, ℝ*, < ))
10831, 35, 1073eqtr4d 2846 . . 3 ((𝜑 ∧ ¬ +∞ ∈ 𝐴) → sup(𝐴, ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ))
10921, 108pm2.61dan 812 . 2 (𝜑 → sup(𝐴, ℝ*, < ) = -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ))
110 xnegeq 12592 . . . . . . 7 (𝑦 = 𝑥 → -𝑒𝑦 = -𝑒𝑥)
111110eleq1d 2877 . . . . . 6 (𝑦 = 𝑥 → (-𝑒𝑦𝐴 ↔ -𝑒𝑥𝐴))
112111cbvrabv 3442 . . . . 5 {𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴} = {𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}
113112infeq1i 8930 . . . 4 inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = inf({𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}, ℝ*, < )
114113xnegeqi 42064 . . 3 -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -𝑒inf({𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}, ℝ*, < )
115114a1i 11 . 2 (𝜑 → -𝑒inf({𝑦 ∈ ℝ* ∣ -𝑒𝑦𝐴}, ℝ*, < ) = -𝑒inf({𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}, ℝ*, < ))
116109, 115eqtrd 2836 1 (𝜑 → sup(𝐴, ℝ*, < ) = -𝑒inf({𝑥 ∈ ℝ* ∣ -𝑒𝑥𝐴}, ℝ*, < ))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 399   = wceq 1538  wcel 2112  wne 2990  wral 3109  {crab 3113  cdif 3881  wss 3884  {csn 4528  supcsup 8892  infcinf 8893  cr 10529  +∞cpnf 10665  -∞cmnf 10666  *cxr 10667   < clt 10668  -cneg 10864  -𝑒cxne 12496
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2114  ax-9 2122  ax-10 2143  ax-11 2159  ax-12 2176  ax-ext 2773  ax-sep 5170  ax-nul 5177  ax-pow 5234  ax-pr 5298  ax-un 7445  ax-cnex 10586  ax-resscn 10587  ax-1cn 10588  ax-icn 10589  ax-addcl 10590  ax-addrcl 10591  ax-mulcl 10592  ax-mulrcl 10593  ax-mulcom 10594  ax-addass 10595  ax-mulass 10596  ax-distr 10597  ax-i2m1 10598  ax-1ne0 10599  ax-1rid 10600  ax-rnegex 10601  ax-rrecex 10602  ax-cnre 10603  ax-pre-lttri 10604  ax-pre-lttrn 10605  ax-pre-ltadd 10606  ax-pre-mulgt0 10607  ax-pre-sup 10608
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 845  df-3or 1085  df-3an 1086  df-tru 1541  df-ex 1782  df-nf 1786  df-sb 2070  df-mo 2601  df-eu 2632  df-clab 2780  df-cleq 2794  df-clel 2873  df-nfc 2941  df-ne 2991  df-nel 3095  df-ral 3114  df-rex 3115  df-reu 3116  df-rmo 3117  df-rab 3118  df-v 3446  df-sbc 3724  df-csb 3832  df-dif 3887  df-un 3889  df-in 3891  df-ss 3901  df-nul 4247  df-if 4429  df-pw 4502  df-sn 4529  df-pr 4531  df-op 4535  df-uni 4804  df-br 5034  df-opab 5096  df-mpt 5114  df-id 5428  df-po 5442  df-so 5443  df-xp 5529  df-rel 5530  df-cnv 5531  df-co 5532  df-dm 5533  df-rn 5534  df-res 5535  df-ima 5536  df-iota 6287  df-fun 6330  df-fn 6331  df-f 6332  df-f1 6333  df-fo 6334  df-f1o 6335  df-fv 6336  df-isom 6337  df-riota 7097  df-ov 7142  df-oprab 7143  df-mpo 7144  df-er 8276  df-en 8497  df-dom 8498  df-sdom 8499  df-sup 8894  df-inf 8895  df-pnf 10670  df-mnf 10671  df-xr 10672  df-ltxr 10673  df-le 10674  df-sub 10865  df-neg 10866  df-xneg 12499
This theorem is referenced by:  supminfxrrnmpt  42097  liminfvalxr  42412
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