Proof of Theorem xnegdi
| Step | Hyp | Ref
| Expression |
| 1 | | elxr 13245 |
. 2
⊢ (𝐴 ∈ ℝ*
↔ (𝐴 ∈ ℝ
∨ 𝐴 = +∞ ∨
𝐴 =
-∞)) |
| 2 | | elxr 13245 |
. . . 4
⊢ (𝐵 ∈ ℝ*
↔ (𝐵 ∈ ℝ
∨ 𝐵 = +∞ ∨
𝐵 =
-∞)) |
| 3 | | recn 11290 |
. . . . . . . 8
⊢ (𝐴 ∈ ℝ → 𝐴 ∈
ℂ) |
| 4 | | recn 11290 |
. . . . . . . 8
⊢ (𝐵 ∈ ℝ → 𝐵 ∈
ℂ) |
| 5 | | negdi 11615 |
. . . . . . . 8
⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → -(𝐴 + 𝐵) = ( -𝐴 + -𝐵)) |
| 6 | 3, 4, 5 | syl2an 608 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → -(𝐴 + 𝐵) = ( -𝐴 + -𝐵)) |
| 7 | | readdcl 11283 |
. . . . . . . 8
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) ∈ ℝ) |
| 8 | | rexneg 13341 |
. . . . . . . 8
⊢ ((𝐴 + 𝐵) ∈ ℝ → -e(𝐴 + 𝐵) = -(𝐴 + 𝐵)) |
| 9 | 7, 8 | syl 18 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) →
-e(𝐴 + 𝐵) = -(𝐴 + 𝐵)) |
| 10 | | renegcl 11621 |
. . . . . . . 8
⊢ (𝐴 ∈ ℝ → -𝐴 ∈
ℝ) |
| 11 | | renegcl 11621 |
. . . . . . . 8
⊢ (𝐵 ∈ ℝ → -𝐵 ∈
ℝ) |
| 12 | | rexadd 13362 |
. . . . . . . 8
⊢ (( -𝐴 ∈ ℝ ∧ -𝐵 ∈ ℝ) → ( -𝐴 +e -𝐵) = ( -𝐴 + -𝐵)) |
| 13 | 10, 11, 12 | syl2an 608 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ( -𝐴 +e -𝐵) = ( -𝐴 + -𝐵)) |
| 14 | 6, 9, 13 | 3eqtr4d 2806 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) →
-e(𝐴 + 𝐵) = ( -𝐴 +e -𝐵)) |
| 15 | | rexadd 13362 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 +e 𝐵) = (𝐴 + 𝐵)) |
| 16 | | xnegeq 13337 |
. . . . . . 7
⊢ ((𝐴 +e 𝐵) = (𝐴 + 𝐵) → -e(𝐴 +e 𝐵) = -e(𝐴 + 𝐵)) |
| 17 | 15, 16 | syl 18 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) →
-e(𝐴
+e 𝐵) =
-e(𝐴 + 𝐵)) |
| 18 | | rexneg 13341 |
. . . . . . 7
⊢ (𝐴 ∈ ℝ →
-e𝐴 = -𝐴) |
| 19 | | rexneg 13341 |
. . . . . . 7
⊢ (𝐵 ∈ ℝ →
-e𝐵 = -𝐵) |
| 20 | 18, 19 | oveqan12d 7439 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (
-e𝐴
+e -e𝐵) = ( -𝐴 +e -𝐵)) |
| 21 | 14, 17, 20 | 3eqtr4d 2806 |
. . . . 5
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) →
-e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 22 | | xnegpnf 13339 |
. . . . . 6
⊢
-e+∞ = -∞ |
| 23 | | oveq2 7428 |
. . . . . . . 8
⊢ (𝐵 = +∞ → (𝐴 +e 𝐵) = (𝐴 +e +∞)) |
| 24 | | rexr 11355 |
. . . . . . . . 9
⊢ (𝐴 ∈ ℝ → 𝐴 ∈
ℝ*) |
| 25 | | renemnf 11358 |
. . . . . . . . 9
⊢ (𝐴 ∈ ℝ → 𝐴 ≠ -∞) |
| 26 | | xaddpnf1 13356 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℝ*
∧ 𝐴 ≠ -∞)
→ (𝐴 +e
+∞) = +∞) |
| 27 | 24, 25, 26 | syl2anc 596 |
. . . . . . . 8
⊢ (𝐴 ∈ ℝ → (𝐴 +e +∞) =
+∞) |
| 28 | 23, 27 | sylan9eqr 2818 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = +∞) → (𝐴 +e 𝐵) = +∞) |
| 29 | | xnegeq 13337 |
. . . . . . 7
⊢ ((𝐴 +e 𝐵) = +∞ → -e(𝐴 +e 𝐵) = -e+∞) |
| 30 | 28, 29 | syl 18 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = +∞) →
-e(𝐴
+e 𝐵) =
-e+∞) |
| 31 | | xnegeq 13337 |
. . . . . . . . 9
⊢ (𝐵 = +∞ →
-e𝐵 =
-e+∞) |
| 32 | 31, 22 | eqtrdi 2812 |
. . . . . . . 8
⊢ (𝐵 = +∞ →
-e𝐵 =
-∞) |
| 33 | 32 | oveq2d 7436 |
. . . . . . 7
⊢ (𝐵 = +∞ → (
-e𝐴
+e -e𝐵) = ( -e𝐴 +e -∞)) |
| 34 | 18, 10 | eqeltrd 2861 |
. . . . . . . 8
⊢ (𝐴 ∈ ℝ →
-e𝐴 ∈
ℝ) |
| 35 | | rexr 11355 |
. . . . . . . . 9
⊢ (
-e𝐴 ∈
ℝ → -e𝐴 ∈
ℝ*) |
| 36 | | renepnf 11357 |
. . . . . . . . 9
⊢ (
-e𝐴 ∈
ℝ → -e𝐴 ≠ +∞) |
| 37 | | xaddmnf1 13358 |
. . . . . . . . 9
⊢ ((
-e𝐴 ∈
ℝ* ∧ -e𝐴 ≠ +∞) → ( -e𝐴 +e -∞) =
-∞) |
| 38 | 35, 36, 37 | syl2anc 596 |
. . . . . . . 8
⊢ (
-e𝐴 ∈
ℝ → ( -e𝐴 +e -∞) =
-∞) |
| 39 | 34, 38 | syl 18 |
. . . . . . 7
⊢ (𝐴 ∈ ℝ → (
-e𝐴
+e -∞) = -∞) |
| 40 | 33, 39 | sylan9eqr 2818 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = +∞) → (
-e𝐴
+e -e𝐵) = -∞) |
| 41 | 22, 30, 40 | 3eqtr4a 2822 |
. . . . 5
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = +∞) →
-e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 42 | | xnegmnf 13340 |
. . . . . 6
⊢
-e-∞ = +∞ |
| 43 | | oveq2 7428 |
. . . . . . . 8
⊢ (𝐵 = -∞ → (𝐴 +e 𝐵) = (𝐴 +e -∞)) |
| 44 | | renepnf 11357 |
. . . . . . . . 9
⊢ (𝐴 ∈ ℝ → 𝐴 ≠ +∞) |
| 45 | | xaddmnf1 13358 |
. . . . . . . . 9
⊢ ((𝐴 ∈ ℝ*
∧ 𝐴 ≠ +∞)
→ (𝐴 +e
-∞) = -∞) |
| 46 | 24, 44, 45 | syl2anc 596 |
. . . . . . . 8
⊢ (𝐴 ∈ ℝ → (𝐴 +e -∞) =
-∞) |
| 47 | 43, 46 | sylan9eqr 2818 |
. . . . . . 7
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = -∞) → (𝐴 +e 𝐵) = -∞) |
| 48 | | xnegeq 13337 |
. . . . . . 7
⊢ ((𝐴 +e 𝐵) = -∞ → -e(𝐴 +e 𝐵) = -e-∞) |
| 49 | 47, 48 | syl 18 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = -∞) →
-e(𝐴
+e 𝐵) =
-e-∞) |
| 50 | | xnegeq 13337 |
. . . . . . . . 9
⊢ (𝐵 = -∞ →
-e𝐵 =
-e-∞) |
| 51 | 50, 42 | eqtrdi 2812 |
. . . . . . . 8
⊢ (𝐵 = -∞ →
-e𝐵 =
+∞) |
| 52 | 51 | oveq2d 7436 |
. . . . . . 7
⊢ (𝐵 = -∞ → (
-e𝐴
+e -e𝐵) = ( -e𝐴 +e +∞)) |
| 53 | | renemnf 11358 |
. . . . . . . . 9
⊢ (
-e𝐴 ∈
ℝ → -e𝐴 ≠ -∞) |
| 54 | | xaddpnf1 13356 |
. . . . . . . . 9
⊢ ((
-e𝐴 ∈
ℝ* ∧ -e𝐴 ≠ -∞) → ( -e𝐴 +e +∞) =
+∞) |
| 55 | 35, 53, 54 | syl2anc 596 |
. . . . . . . 8
⊢ (
-e𝐴 ∈
ℝ → ( -e𝐴 +e +∞) =
+∞) |
| 56 | 34, 55 | syl 18 |
. . . . . . 7
⊢ (𝐴 ∈ ℝ → (
-e𝐴
+e +∞) = +∞) |
| 57 | 52, 56 | sylan9eqr 2818 |
. . . . . 6
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = -∞) → (
-e𝐴
+e -e𝐵) = +∞) |
| 58 | 42, 49, 57 | 3eqtr4a 2822 |
. . . . 5
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 = -∞) →
-e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 59 | 21, 41, 58 | 3jaodan 1458 |
. . . 4
⊢ ((𝐴 ∈ ℝ ∧ (𝐵 ∈ ℝ ∨ 𝐵 = +∞ ∨ 𝐵 = -∞)) →
-e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 60 | 2, 59 | sylan2b 606 |
. . 3
⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 61 | | xneg0 13342 |
. . . . . . 7
⊢
-e0 = 0 |
| 62 | | simpr 490 |
. . . . . . . . . 10
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
𝐵 =
-∞) |
| 63 | 62 | oveq2d 7436 |
. . . . . . . . 9
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
(+∞ +e 𝐵)
= (+∞ +e -∞)) |
| 64 | | pnfaddmnf 13360 |
. . . . . . . . 9
⊢ (+∞
+e -∞) = 0 |
| 65 | 63, 64 | eqtrdi 2812 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
(+∞ +e 𝐵)
= 0) |
| 66 | | xnegeq 13337 |
. . . . . . . 8
⊢
((+∞ +e 𝐵) = 0 → -e(+∞
+e 𝐵) =
-e0) |
| 67 | 65, 66 | syl 18 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
-e(+∞ +e 𝐵) = -e0) |
| 68 | 51 | adantl 487 |
. . . . . . . . 9
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
-e𝐵 =
+∞) |
| 69 | 68 | oveq2d 7436 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
(-∞ +e -e𝐵) = (-∞ +e
+∞)) |
| 70 | | mnfaddpnf 13361 |
. . . . . . . 8
⊢ (-∞
+e +∞) = 0 |
| 71 | 69, 70 | eqtrdi 2812 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
(-∞ +e -e𝐵) = 0) |
| 72 | 61, 67, 71 | 3eqtr4a 2822 |
. . . . . 6
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = -∞) →
-e(+∞ +e 𝐵) = (-∞ +e
-e𝐵)) |
| 73 | | xaddpnf2 13357 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ -∞)
→ (+∞ +e 𝐵) = +∞) |
| 74 | | xnegeq 13337 |
. . . . . . . 8
⊢
((+∞ +e 𝐵) = +∞ → -e(+∞
+e 𝐵) =
-e+∞) |
| 75 | 73, 74 | syl 18 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ -∞)
→ -e(+∞ +e 𝐵) = -e+∞) |
| 76 | | xnegcl 13343 |
. . . . . . . 8
⊢ (𝐵 ∈ ℝ*
→ -e𝐵
∈ ℝ*) |
| 77 | | xnegeq 13337 |
. . . . . . . . . . . 12
⊢ (
-e𝐵 = +∞
→ -e -e𝐵 = -e+∞) |
| 78 | 77, 22 | eqtrdi 2812 |
. . . . . . . . . . 11
⊢ (
-e𝐵 = +∞
→ -e -e𝐵 = -∞) |
| 79 | | xnegneg 13344 |
. . . . . . . . . . . 12
⊢ (𝐵 ∈ ℝ*
→ -e -e𝐵 = 𝐵) |
| 80 | 79 | eqeq1d 2763 |
. . . . . . . . . . 11
⊢ (𝐵 ∈ ℝ*
→ ( -e -e𝐵 = -∞ ↔ 𝐵 = -∞)) |
| 81 | 78, 80 | imbitrid 247 |
. . . . . . . . . 10
⊢ (𝐵 ∈ ℝ*
→ ( -e𝐵 =
+∞ → 𝐵 =
-∞)) |
| 82 | 81 | necon3d 2977 |
. . . . . . . . 9
⊢ (𝐵 ∈ ℝ*
→ (𝐵 ≠ -∞
→ -e𝐵 ≠
+∞)) |
| 83 | 82 | imp 412 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ -∞)
→ -e𝐵 ≠
+∞) |
| 84 | | xaddmnf2 13359 |
. . . . . . . 8
⊢ ((
-e𝐵 ∈
ℝ* ∧ -e𝐵 ≠ +∞) → (-∞
+e -e𝐵) = -∞) |
| 85 | 76, 83, 84 | syl2an2r 698 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ -∞)
→ (-∞ +e -e𝐵) = -∞) |
| 86 | 22, 75, 85 | 3eqtr4a 2822 |
. . . . . 6
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ -∞)
→ -e(+∞ +e 𝐵) = (-∞ +e
-e𝐵)) |
| 87 | 72, 86 | pm2.61dane 3043 |
. . . . 5
⊢ (𝐵 ∈ ℝ*
→ -e(+∞ +e 𝐵) = (-∞ +e
-e𝐵)) |
| 88 | 87 | adantl 487 |
. . . 4
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ -e(+∞ +e 𝐵) = (-∞ +e
-e𝐵)) |
| 89 | | simpl 488 |
. . . . . 6
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ 𝐴 =
+∞) |
| 90 | 89 | oveq1d 7435 |
. . . . 5
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ (𝐴 +e
𝐵) = (+∞
+e 𝐵)) |
| 91 | | xnegeq 13337 |
. . . . 5
⊢ ((𝐴 +e 𝐵) = (+∞ +e 𝐵) → -e(𝐴 +e 𝐵) = -e(+∞ +e
𝐵)) |
| 92 | 90, 91 | syl 18 |
. . . 4
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) =
-e(+∞ +e 𝐵)) |
| 93 | | xnegeq 13337 |
. . . . . . 7
⊢ (𝐴 = +∞ →
-e𝐴 =
-e+∞) |
| 94 | 93 | adantr 486 |
. . . . . 6
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ -e𝐴 =
-e+∞) |
| 95 | 94, 22 | eqtrdi 2812 |
. . . . 5
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ -e𝐴 =
-∞) |
| 96 | 95 | oveq1d 7435 |
. . . 4
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ ( -e𝐴
+e -e𝐵) = (-∞ +e
-e𝐵)) |
| 97 | 88, 92, 96 | 3eqtr4d 2806 |
. . 3
⊢ ((𝐴 = +∞ ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 98 | | simpr 490 |
. . . . . . . . . 10
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
𝐵 =
+∞) |
| 99 | 98 | oveq2d 7436 |
. . . . . . . . 9
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
(-∞ +e 𝐵)
= (-∞ +e +∞)) |
| 100 | 99, 70 | eqtrdi 2812 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
(-∞ +e 𝐵)
= 0) |
| 101 | | xnegeq 13337 |
. . . . . . . 8
⊢
((-∞ +e 𝐵) = 0 → -e(-∞
+e 𝐵) =
-e0) |
| 102 | 100, 101 | syl 18 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
-e(-∞ +e 𝐵) = -e0) |
| 103 | 32 | adantl 487 |
. . . . . . . . 9
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
-e𝐵 =
-∞) |
| 104 | 103 | oveq2d 7436 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
(+∞ +e -e𝐵) = (+∞ +e
-∞)) |
| 105 | 104, 64 | eqtrdi 2812 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
(+∞ +e -e𝐵) = 0) |
| 106 | 61, 102, 105 | 3eqtr4a 2822 |
. . . . . 6
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 = +∞) →
-e(-∞ +e 𝐵) = (+∞ +e
-e𝐵)) |
| 107 | | xaddmnf2 13359 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ +∞)
→ (-∞ +e 𝐵) = -∞) |
| 108 | | xnegeq 13337 |
. . . . . . . 8
⊢
((-∞ +e 𝐵) = -∞ → -e(-∞
+e 𝐵) =
-e-∞) |
| 109 | 107, 108 | syl 18 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ +∞)
→ -e(-∞ +e 𝐵) = -e-∞) |
| 110 | | xnegeq 13337 |
. . . . . . . . . . . 12
⊢ (
-e𝐵 = -∞
→ -e -e𝐵 = -e-∞) |
| 111 | 110, 42 | eqtrdi 2812 |
. . . . . . . . . . 11
⊢ (
-e𝐵 = -∞
→ -e -e𝐵 = +∞) |
| 112 | 79 | eqeq1d 2763 |
. . . . . . . . . . 11
⊢ (𝐵 ∈ ℝ*
→ ( -e -e𝐵 = +∞ ↔ 𝐵 = +∞)) |
| 113 | 111, 112 | imbitrid 247 |
. . . . . . . . . 10
⊢ (𝐵 ∈ ℝ*
→ ( -e𝐵 =
-∞ → 𝐵 =
+∞)) |
| 114 | 113 | necon3d 2977 |
. . . . . . . . 9
⊢ (𝐵 ∈ ℝ*
→ (𝐵 ≠ +∞
→ -e𝐵 ≠
-∞)) |
| 115 | 114 | imp 412 |
. . . . . . . 8
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ +∞)
→ -e𝐵 ≠
-∞) |
| 116 | | xaddpnf2 13357 |
. . . . . . . 8
⊢ ((
-e𝐵 ∈
ℝ* ∧ -e𝐵 ≠ -∞) → (+∞
+e -e𝐵) = +∞) |
| 117 | 76, 115, 116 | syl2an2r 698 |
. . . . . . 7
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ +∞)
→ (+∞ +e -e𝐵) = +∞) |
| 118 | 42, 109, 117 | 3eqtr4a 2822 |
. . . . . 6
⊢ ((𝐵 ∈ ℝ*
∧ 𝐵 ≠ +∞)
→ -e(-∞ +e 𝐵) = (+∞ +e
-e𝐵)) |
| 119 | 106, 118 | pm2.61dane 3043 |
. . . . 5
⊢ (𝐵 ∈ ℝ*
→ -e(-∞ +e 𝐵) = (+∞ +e
-e𝐵)) |
| 120 | 119 | adantl 487 |
. . . 4
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ -e(-∞ +e 𝐵) = (+∞ +e
-e𝐵)) |
| 121 | | simpl 488 |
. . . . . 6
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ 𝐴 =
-∞) |
| 122 | 121 | oveq1d 7435 |
. . . . 5
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ (𝐴 +e
𝐵) = (-∞
+e 𝐵)) |
| 123 | | xnegeq 13337 |
. . . . 5
⊢ ((𝐴 +e 𝐵) = (-∞ +e 𝐵) → -e(𝐴 +e 𝐵) = -e(-∞ +e
𝐵)) |
| 124 | 122, 123 | syl 18 |
. . . 4
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) =
-e(-∞ +e 𝐵)) |
| 125 | | xnegeq 13337 |
. . . . . . 7
⊢ (𝐴 = -∞ →
-e𝐴 =
-e-∞) |
| 126 | 125 | adantr 486 |
. . . . . 6
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ -e𝐴 =
-e-∞) |
| 127 | 126, 42 | eqtrdi 2812 |
. . . . 5
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ -e𝐴 =
+∞) |
| 128 | 127 | oveq1d 7435 |
. . . 4
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ ( -e𝐴
+e -e𝐵) = (+∞ +e
-e𝐵)) |
| 129 | 120, 124,
128 | 3eqtr4d 2806 |
. . 3
⊢ ((𝐴 = -∞ ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 130 | 60, 97, 129 | 3jaoian 1457 |
. 2
⊢ (((𝐴 ∈ ℝ ∨ 𝐴 = +∞ ∨ 𝐴 = -∞) ∧ 𝐵 ∈ ℝ*)
→ -e(𝐴
+e 𝐵) = (
-e𝐴
+e -e𝐵)) |
| 131 | 1, 130 | sylanb 593 |
1
⊢ ((𝐴 ∈ ℝ*
∧ 𝐵 ∈
ℝ*) → -e(𝐴 +e 𝐵) = ( -e𝐴 +e -e𝐵)) |