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Description: If Y is a multiple of _pi then it belongs to an open inerval ( A (,) B ) such that for any other point y in the interval, cos y/2 and sin y/2 are nonzero. Such an interval is needed to apply De L'Hopital theorem. (Contributed by Glauco Siliprandi, 11-Dec-2019)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | dirkercncflem1.a | ⊢ 𝐴 = ( 𝑌 − π ) | |
| dirkercncflem1.b | ⊢ 𝐵 = ( 𝑌 + π ) | ||
| dirkercncflem1.y | ⊢ ( 𝜑 → 𝑌 ∈ ℝ ) | ||
| dirkercncflem1.ymod0 | ⊢ ( 𝜑 → ( 𝑌 mod ( 2 · π ) ) = 0 ) | ||
| Assertion | dirkercncflem1 | ⊢ ( 𝜑 → ( 𝑌 ∈ ( 𝐴 (,) 𝐵 ) ∧ ∀ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ( ( sin ‘ ( 𝑦 / 2 ) ) ≠ 0 ∧ ( cos ‘ ( 𝑦 / 2 ) ) ≠ 0 ) ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dirkercncflem1.a | ⊢ 𝐴 = ( 𝑌 − π ) | |
| 2 | dirkercncflem1.b | ⊢ 𝐵 = ( 𝑌 + π ) | |
| 3 | dirkercncflem1.y | ⊢ ( 𝜑 → 𝑌 ∈ ℝ ) | |
| 4 | dirkercncflem1.ymod0 | ⊢ ( 𝜑 → ( 𝑌 mod ( 2 · π ) ) = 0 ) | |
| 5 | pire | ⊢ π ∈ ℝ | |
| 6 | 5 | a1i | ⊢ ( 𝜑 → π ∈ ℝ ) |
| 7 | 3 6 | resubcld | ⊢ ( 𝜑 → ( 𝑌 − π ) ∈ ℝ ) |
| 8 | 7 | rexrd | ⊢ ( 𝜑 → ( 𝑌 − π ) ∈ ℝ* ) |
| 9 | 1 8 | eqeltrid | ⊢ ( 𝜑 → 𝐴 ∈ ℝ* ) |
| 10 | 3 6 | readdcld | ⊢ ( 𝜑 → ( 𝑌 + π ) ∈ ℝ ) |
| 11 | 10 | rexrd | ⊢ ( 𝜑 → ( 𝑌 + π ) ∈ ℝ* ) |
| 12 | 2 11 | eqeltrid | ⊢ ( 𝜑 → 𝐵 ∈ ℝ* ) |
| 13 | pipos | ⊢ 0 < π | |
| 14 | ltsubpos | ⊢ ( ( π ∈ ℝ ∧ 𝑌 ∈ ℝ ) → ( 0 < π ↔ ( 𝑌 − π ) < 𝑌 ) ) | |
| 15 | 13 14 | mpbii | ⊢ ( ( π ∈ ℝ ∧ 𝑌 ∈ ℝ ) → ( 𝑌 − π ) < 𝑌 ) |
| 16 | 6 3 15 | syl2anc | ⊢ ( 𝜑 → ( 𝑌 − π ) < 𝑌 ) |
| 17 | 1 16 | eqbrtrid | ⊢ ( 𝜑 → 𝐴 < 𝑌 ) |
| 18 | ltaddpos | ⊢ ( ( π ∈ ℝ ∧ 𝑌 ∈ ℝ ) → ( 0 < π ↔ 𝑌 < ( 𝑌 + π ) ) ) | |
| 19 | 13 18 | mpbii | ⊢ ( ( π ∈ ℝ ∧ 𝑌 ∈ ℝ ) → 𝑌 < ( 𝑌 + π ) ) |
| 20 | 6 3 19 | syl2anc | ⊢ ( 𝜑 → 𝑌 < ( 𝑌 + π ) ) |
| 21 | 20 2 | breqtrrdi | ⊢ ( 𝜑 → 𝑌 < 𝐵 ) |
| 22 | 9 12 3 17 21 | eliood | ⊢ ( 𝜑 → 𝑌 ∈ ( 𝐴 (,) 𝐵 ) ) |
| 23 | eldifi | ⊢ ( 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) → 𝑦 ∈ ( 𝐴 (,) 𝐵 ) ) | |
| 24 | 23 | elioored | ⊢ ( 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) → 𝑦 ∈ ℝ ) |
| 25 | 24 | adantl | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝑦 ∈ ℝ ) |
| 26 | 25 | recnd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝑦 ∈ ℂ ) |
| 27 | 2cnd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 2 ∈ ℂ ) | |
| 28 | picn | ⊢ π ∈ ℂ | |
| 29 | 28 | a1i | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → π ∈ ℂ ) |
| 30 | 2ne0 | ⊢ 2 ≠ 0 | |
| 31 | 30 | a1i | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 2 ≠ 0 ) |
| 32 | 5 13 | gt0ne0ii | ⊢ π ≠ 0 |
| 33 | 32 | a1i | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → π ≠ 0 ) |
| 34 | 26 27 29 31 33 | divdiv1d | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑦 / 2 ) / π ) = ( 𝑦 / ( 2 · π ) ) ) |
| 35 | 2rp | ⊢ 2 ∈ ℝ+ | |
| 36 | 35 | a1i | ⊢ ( 𝜑 → 2 ∈ ℝ+ ) |
| 37 | pirp | ⊢ π ∈ ℝ+ | |
| 38 | 37 | a1i | ⊢ ( 𝜑 → π ∈ ℝ+ ) |
| 39 | 36 38 | rpmulcld | ⊢ ( 𝜑 → ( 2 · π ) ∈ ℝ+ ) |
| 40 | mod0 | ⊢ ( ( 𝑌 ∈ ℝ ∧ ( 2 · π ) ∈ ℝ+ ) → ( ( 𝑌 mod ( 2 · π ) ) = 0 ↔ ( 𝑌 / ( 2 · π ) ) ∈ ℤ ) ) | |
| 41 | 3 39 40 | syl2anc | ⊢ ( 𝜑 → ( ( 𝑌 mod ( 2 · π ) ) = 0 ↔ ( 𝑌 / ( 2 · π ) ) ∈ ℤ ) ) |
| 42 | 4 41 | mpbid | ⊢ ( 𝜑 → ( 𝑌 / ( 2 · π ) ) ∈ ℤ ) |
| 43 | peano2zm | ⊢ ( ( 𝑌 / ( 2 · π ) ) ∈ ℤ → ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℤ ) | |
| 44 | 42 43 | syl | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℤ ) |
| 45 | 44 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℤ ) |
| 46 | 44 | zred | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℝ ) |
| 47 | 46 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℝ ) |
| 48 | 1 7 | eqeltrid | ⊢ ( 𝜑 → 𝐴 ∈ ℝ ) |
| 49 | 48 39 | rerpdivcld | ⊢ ( 𝜑 → ( 𝐴 / ( 2 · π ) ) ∈ ℝ ) |
| 50 | 49 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝐴 / ( 2 · π ) ) ∈ ℝ ) |
| 51 | 39 | rpred | ⊢ ( 𝜑 → ( 2 · π ) ∈ ℝ ) |
| 52 | 51 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 2 · π ) ∈ ℝ ) |
| 53 | 39 | rpne0d | ⊢ ( 𝜑 → ( 2 · π ) ≠ 0 ) |
| 54 | 53 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 2 · π ) ≠ 0 ) |
| 55 | 25 52 54 | redivcld | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 / ( 2 · π ) ) ∈ ℝ ) |
| 56 | 51 | recnd | ⊢ ( 𝜑 → ( 2 · π ) ∈ ℂ ) |
| 57 | 56 53 | dividd | ⊢ ( 𝜑 → ( ( 2 · π ) / ( 2 · π ) ) = 1 ) |
| 58 | 57 | eqcomd | ⊢ ( 𝜑 → 1 = ( ( 2 · π ) / ( 2 · π ) ) ) |
| 59 | 58 | oveq2d | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) − 1 ) = ( ( 𝑌 / ( 2 · π ) ) − ( ( 2 · π ) / ( 2 · π ) ) ) ) |
| 60 | 3 | recnd | ⊢ ( 𝜑 → 𝑌 ∈ ℂ ) |
| 61 | 60 56 56 53 | divsubdird | ⊢ ( 𝜑 → ( ( 𝑌 − ( 2 · π ) ) / ( 2 · π ) ) = ( ( 𝑌 / ( 2 · π ) ) − ( ( 2 · π ) / ( 2 · π ) ) ) ) |
| 62 | 59 61 | eqtr4d | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) − 1 ) = ( ( 𝑌 − ( 2 · π ) ) / ( 2 · π ) ) ) |
| 63 | 3 51 | resubcld | ⊢ ( 𝜑 → ( 𝑌 − ( 2 · π ) ) ∈ ℝ ) |
| 64 | 28 | mullidi | ⊢ ( 1 · π ) = π |
| 65 | 64 | eqcomi | ⊢ π = ( 1 · π ) |
| 66 | 1lt2 | ⊢ 1 < 2 | |
| 67 | 1re | ⊢ 1 ∈ ℝ | |
| 68 | 2re | ⊢ 2 ∈ ℝ | |
| 69 | 67 68 5 13 | ltmul1ii | ⊢ ( 1 < 2 ↔ ( 1 · π ) < ( 2 · π ) ) |
| 70 | 66 69 | mpbi | ⊢ ( 1 · π ) < ( 2 · π ) |
| 71 | 65 70 | eqbrtri | ⊢ π < ( 2 · π ) |
| 72 | 71 | a1i | ⊢ ( 𝜑 → π < ( 2 · π ) ) |
| 73 | 6 51 3 72 | ltsub2dd | ⊢ ( 𝜑 → ( 𝑌 − ( 2 · π ) ) < ( 𝑌 − π ) ) |
| 74 | 73 1 | breqtrrdi | ⊢ ( 𝜑 → ( 𝑌 − ( 2 · π ) ) < 𝐴 ) |
| 75 | 63 48 39 74 | ltdiv1dd | ⊢ ( 𝜑 → ( ( 𝑌 − ( 2 · π ) ) / ( 2 · π ) ) < ( 𝐴 / ( 2 · π ) ) ) |
| 76 | 62 75 | eqbrtrd | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) − 1 ) < ( 𝐴 / ( 2 · π ) ) ) |
| 77 | 76 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑌 / ( 2 · π ) ) − 1 ) < ( 𝐴 / ( 2 · π ) ) ) |
| 78 | 48 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝐴 ∈ ℝ ) |
| 79 | 39 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 2 · π ) ∈ ℝ+ ) |
| 80 | 23 | adantl | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝑦 ∈ ( 𝐴 (,) 𝐵 ) ) |
| 81 | 9 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝐴 ∈ ℝ* ) |
| 82 | 12 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝐵 ∈ ℝ* ) |
| 83 | elioo2 | ⊢ ( ( 𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ* ) → ( 𝑦 ∈ ( 𝐴 (,) 𝐵 ) ↔ ( 𝑦 ∈ ℝ ∧ 𝐴 < 𝑦 ∧ 𝑦 < 𝐵 ) ) ) | |
| 84 | 81 82 83 | syl2anc | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 ∈ ( 𝐴 (,) 𝐵 ) ↔ ( 𝑦 ∈ ℝ ∧ 𝐴 < 𝑦 ∧ 𝑦 < 𝐵 ) ) ) |
| 85 | 80 84 | mpbid | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 ∈ ℝ ∧ 𝐴 < 𝑦 ∧ 𝑦 < 𝐵 ) ) |
| 86 | 85 | simp2d | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝐴 < 𝑦 ) |
| 87 | 78 25 79 86 | ltdiv1dd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝐴 / ( 2 · π ) ) < ( 𝑦 / ( 2 · π ) ) ) |
| 88 | 47 50 55 77 87 | lttrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑌 / ( 2 · π ) ) − 1 ) < ( 𝑦 / ( 2 · π ) ) ) |
| 89 | 88 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( ( 𝑌 / ( 2 · π ) ) − 1 ) < ( 𝑦 / ( 2 · π ) ) ) |
| 90 | 24 | ad2antlr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → 𝑦 ∈ ℝ ) |
| 91 | 3 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → 𝑌 ∈ ℝ ) |
| 92 | 39 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( 2 · π ) ∈ ℝ+ ) |
| 93 | simpr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → 𝑦 < 𝑌 ) | |
| 94 | 90 91 92 93 | ltdiv1dd | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( 𝑦 / ( 2 · π ) ) < ( 𝑌 / ( 2 · π ) ) ) |
| 95 | 60 56 53 | divcld | ⊢ ( 𝜑 → ( 𝑌 / ( 2 · π ) ) ∈ ℂ ) |
| 96 | 95 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) ∈ ℂ ) |
| 97 | 1cnd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 1 ∈ ℂ ) | |
| 98 | 96 97 | npcand | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) + 1 ) = ( 𝑌 / ( 2 · π ) ) ) |
| 99 | 98 | eqcomd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) = ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) + 1 ) ) |
| 100 | 99 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( 𝑌 / ( 2 · π ) ) = ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) + 1 ) ) |
| 101 | 94 100 | breqtrd | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ( 𝑦 / ( 2 · π ) ) < ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) + 1 ) ) |
| 102 | btwnnz | ⊢ ( ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) ∈ ℤ ∧ ( ( 𝑌 / ( 2 · π ) ) − 1 ) < ( 𝑦 / ( 2 · π ) ) ∧ ( 𝑦 / ( 2 · π ) ) < ( ( ( 𝑌 / ( 2 · π ) ) − 1 ) + 1 ) ) → ¬ ( 𝑦 / ( 2 · π ) ) ∈ ℤ ) | |
| 103 | 45 89 101 102 | syl3anc | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 < 𝑌 ) → ¬ ( 𝑦 / ( 2 · π ) ) ∈ ℤ ) |
| 104 | 42 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ( 𝑌 / ( 2 · π ) ) ∈ ℤ ) |
| 105 | 3 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → 𝑌 ∈ ℝ ) |
| 106 | 25 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → 𝑦 ∈ ℝ ) |
| 107 | 79 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ( 2 · π ) ∈ ℝ+ ) |
| 108 | 25 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 ≤ 𝑌 ) → 𝑦 ∈ ℝ ) |
| 109 | 3 | ad2antrr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 ≤ 𝑌 ) → 𝑌 ∈ ℝ ) |
| 110 | simpr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 ≤ 𝑌 ) → 𝑦 ≤ 𝑌 ) | |
| 111 | eldifsni | ⊢ ( 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) → 𝑦 ≠ 𝑌 ) | |
| 112 | 111 | necomd | ⊢ ( 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) → 𝑌 ≠ 𝑦 ) |
| 113 | 112 | ad2antlr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 ≤ 𝑌 ) → 𝑌 ≠ 𝑦 ) |
| 114 | 108 109 110 113 | leneltd | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ 𝑦 ≤ 𝑌 ) → 𝑦 < 𝑌 ) |
| 115 | 114 | stoic1a | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ¬ 𝑦 ≤ 𝑌 ) |
| 116 | 105 106 | ltnled | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ( 𝑌 < 𝑦 ↔ ¬ 𝑦 ≤ 𝑌 ) ) |
| 117 | 115 116 | mpbird | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → 𝑌 < 𝑦 ) |
| 118 | 105 106 107 117 | ltdiv1dd | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ( 𝑌 / ( 2 · π ) ) < ( 𝑦 / ( 2 · π ) ) ) |
| 119 | 2 10 | eqeltrid | ⊢ ( 𝜑 → 𝐵 ∈ ℝ ) |
| 120 | 119 39 | rerpdivcld | ⊢ ( 𝜑 → ( 𝐵 / ( 2 · π ) ) ∈ ℝ ) |
| 121 | 120 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝐵 / ( 2 · π ) ) ∈ ℝ ) |
| 122 | 3 39 | rerpdivcld | ⊢ ( 𝜑 → ( 𝑌 / ( 2 · π ) ) ∈ ℝ ) |
| 123 | 122 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) ∈ ℝ ) |
| 124 | 1red | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 1 ∈ ℝ ) | |
| 125 | 123 124 | readdcld | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑌 / ( 2 · π ) ) + 1 ) ∈ ℝ ) |
| 126 | 119 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝐵 ∈ ℝ ) |
| 127 | 85 | simp3d | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → 𝑦 < 𝐵 ) |
| 128 | 25 126 79 127 | ltdiv1dd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 / ( 2 · π ) ) < ( 𝐵 / ( 2 · π ) ) ) |
| 129 | 2 | oveq1i | ⊢ ( 𝐵 / ( 2 · π ) ) = ( ( 𝑌 + π ) / ( 2 · π ) ) |
| 130 | 28 | a1i | ⊢ ( 𝜑 → π ∈ ℂ ) |
| 131 | 60 130 56 53 | divdird | ⊢ ( 𝜑 → ( ( 𝑌 + π ) / ( 2 · π ) ) = ( ( 𝑌 / ( 2 · π ) ) + ( π / ( 2 · π ) ) ) ) |
| 132 | 6 39 | rerpdivcld | ⊢ ( 𝜑 → ( π / ( 2 · π ) ) ∈ ℝ ) |
| 133 | 1red | ⊢ ( 𝜑 → 1 ∈ ℝ ) | |
| 134 | 2cn | ⊢ 2 ∈ ℂ | |
| 135 | 134 28 | mulcomi | ⊢ ( 2 · π ) = ( π · 2 ) |
| 136 | 135 | oveq2i | ⊢ ( π / ( 2 · π ) ) = ( π / ( π · 2 ) ) |
| 137 | 28 32 | pm3.2i | ⊢ ( π ∈ ℂ ∧ π ≠ 0 ) |
| 138 | 2cnne0 | ⊢ ( 2 ∈ ℂ ∧ 2 ≠ 0 ) | |
| 139 | divdiv1 | ⊢ ( ( π ∈ ℂ ∧ ( π ∈ ℂ ∧ π ≠ 0 ) ∧ ( 2 ∈ ℂ ∧ 2 ≠ 0 ) ) → ( ( π / π ) / 2 ) = ( π / ( π · 2 ) ) ) | |
| 140 | 28 137 138 139 | mp3an | ⊢ ( ( π / π ) / 2 ) = ( π / ( π · 2 ) ) |
| 141 | 28 32 | dividi | ⊢ ( π / π ) = 1 |
| 142 | 141 | oveq1i | ⊢ ( ( π / π ) / 2 ) = ( 1 / 2 ) |
| 143 | 136 140 142 | 3eqtr2i | ⊢ ( π / ( 2 · π ) ) = ( 1 / 2 ) |
| 144 | halflt1 | ⊢ ( 1 / 2 ) < 1 | |
| 145 | 143 144 | eqbrtri | ⊢ ( π / ( 2 · π ) ) < 1 |
| 146 | 145 | a1i | ⊢ ( 𝜑 → ( π / ( 2 · π ) ) < 1 ) |
| 147 | 132 133 122 146 | ltadd2dd | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) + ( π / ( 2 · π ) ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 148 | 131 147 | eqbrtrd | ⊢ ( 𝜑 → ( ( 𝑌 + π ) / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 149 | 129 148 | eqbrtrid | ⊢ ( 𝜑 → ( 𝐵 / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 150 | 149 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝐵 / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 151 | 55 121 125 128 150 | lttrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 152 | 151 | adantr | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ( 𝑦 / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 153 | btwnnz | ⊢ ( ( ( 𝑌 / ( 2 · π ) ) ∈ ℤ ∧ ( 𝑌 / ( 2 · π ) ) < ( 𝑦 / ( 2 · π ) ) ∧ ( 𝑦 / ( 2 · π ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) → ¬ ( 𝑦 / ( 2 · π ) ) ∈ ℤ ) | |
| 154 | 104 118 152 153 | syl3anc | ⊢ ( ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) ∧ ¬ 𝑦 < 𝑌 ) → ¬ ( 𝑦 / ( 2 · π ) ) ∈ ℤ ) |
| 155 | 103 154 | pm2.61dan | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( 𝑦 / ( 2 · π ) ) ∈ ℤ ) |
| 156 | 34 155 | eqneltrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( ( 𝑦 / 2 ) / π ) ∈ ℤ ) |
| 157 | 26 | halfcld | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑦 / 2 ) ∈ ℂ ) |
| 158 | sineq0 | ⊢ ( ( 𝑦 / 2 ) ∈ ℂ → ( ( sin ‘ ( 𝑦 / 2 ) ) = 0 ↔ ( ( 𝑦 / 2 ) / π ) ∈ ℤ ) ) | |
| 159 | 157 158 | syl | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( sin ‘ ( 𝑦 / 2 ) ) = 0 ↔ ( ( 𝑦 / 2 ) / π ) ∈ ℤ ) ) |
| 160 | 156 159 | mtbird | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( sin ‘ ( 𝑦 / 2 ) ) = 0 ) |
| 161 | 160 | neqned | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( sin ‘ ( 𝑦 / 2 ) ) ≠ 0 ) |
| 162 | 34 | oveq1d | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( ( 𝑦 / 2 ) / π ) + ( 1 / 2 ) ) = ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 163 | 42 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) ∈ ℤ ) |
| 164 | 1 | a1i | ⊢ ( 𝜑 → 𝐴 = ( 𝑌 − π ) ) |
| 165 | 164 | oveq1d | ⊢ ( 𝜑 → ( 𝐴 + π ) = ( ( 𝑌 − π ) + π ) ) |
| 166 | 60 130 | npcand | ⊢ ( 𝜑 → ( ( 𝑌 − π ) + π ) = 𝑌 ) |
| 167 | 165 166 | eqtr2d | ⊢ ( 𝜑 → 𝑌 = ( 𝐴 + π ) ) |
| 168 | 167 | oveq1d | ⊢ ( 𝜑 → ( 𝑌 / ( 2 · π ) ) = ( ( 𝐴 + π ) / ( 2 · π ) ) ) |
| 169 | 48 | recnd | ⊢ ( 𝜑 → 𝐴 ∈ ℂ ) |
| 170 | 169 130 56 53 | divdird | ⊢ ( 𝜑 → ( ( 𝐴 + π ) / ( 2 · π ) ) = ( ( 𝐴 / ( 2 · π ) ) + ( π / ( 2 · π ) ) ) ) |
| 171 | 130 | mulridd | ⊢ ( 𝜑 → ( π · 1 ) = π ) |
| 172 | 171 | eqcomd | ⊢ ( 𝜑 → π = ( π · 1 ) ) |
| 173 | 2cnd | ⊢ ( 𝜑 → 2 ∈ ℂ ) | |
| 174 | 173 130 | mulcomd | ⊢ ( 𝜑 → ( 2 · π ) = ( π · 2 ) ) |
| 175 | 172 174 | oveq12d | ⊢ ( 𝜑 → ( π / ( 2 · π ) ) = ( ( π · 1 ) / ( π · 2 ) ) ) |
| 176 | 1cnd | ⊢ ( 𝜑 → 1 ∈ ℂ ) | |
| 177 | 30 | a1i | ⊢ ( 𝜑 → 2 ≠ 0 ) |
| 178 | 32 | a1i | ⊢ ( 𝜑 → π ≠ 0 ) |
| 179 | 176 173 130 177 178 | divcan5d | ⊢ ( 𝜑 → ( ( π · 1 ) / ( π · 2 ) ) = ( 1 / 2 ) ) |
| 180 | 175 179 | eqtrd | ⊢ ( 𝜑 → ( π / ( 2 · π ) ) = ( 1 / 2 ) ) |
| 181 | 180 | oveq2d | ⊢ ( 𝜑 → ( ( 𝐴 / ( 2 · π ) ) + ( π / ( 2 · π ) ) ) = ( ( 𝐴 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 182 | 168 170 181 | 3eqtrd | ⊢ ( 𝜑 → ( 𝑌 / ( 2 · π ) ) = ( ( 𝐴 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 183 | 182 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) = ( ( 𝐴 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 184 | 124 | rehalfcld | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 1 / 2 ) ∈ ℝ ) |
| 185 | 50 55 184 87 | ltadd1dd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝐴 / ( 2 · π ) ) + ( 1 / 2 ) ) < ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 186 | 183 185 | eqbrtrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( 𝑌 / ( 2 · π ) ) < ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 187 | 55 121 184 128 | ltadd1dd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) < ( ( 𝐵 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 188 | 129 | a1i | ⊢ ( 𝜑 → ( 𝐵 / ( 2 · π ) ) = ( ( 𝑌 + π ) / ( 2 · π ) ) ) |
| 189 | 188 | oveq1d | ⊢ ( 𝜑 → ( ( 𝐵 / ( 2 · π ) ) + ( 1 / 2 ) ) = ( ( ( 𝑌 + π ) / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 190 | 180 | oveq2d | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) + ( π / ( 2 · π ) ) ) = ( ( 𝑌 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 191 | 131 190 | eqtrd | ⊢ ( 𝜑 → ( ( 𝑌 + π ) / ( 2 · π ) ) = ( ( 𝑌 / ( 2 · π ) ) + ( 1 / 2 ) ) ) |
| 192 | 191 | oveq1d | ⊢ ( 𝜑 → ( ( ( 𝑌 + π ) / ( 2 · π ) ) + ( 1 / 2 ) ) = ( ( ( 𝑌 / ( 2 · π ) ) + ( 1 / 2 ) ) + ( 1 / 2 ) ) ) |
| 193 | 176 | halfcld | ⊢ ( 𝜑 → ( 1 / 2 ) ∈ ℂ ) |
| 194 | 95 193 193 | addassd | ⊢ ( 𝜑 → ( ( ( 𝑌 / ( 2 · π ) ) + ( 1 / 2 ) ) + ( 1 / 2 ) ) = ( ( 𝑌 / ( 2 · π ) ) + ( ( 1 / 2 ) + ( 1 / 2 ) ) ) ) |
| 195 | 176 | 2halvesd | ⊢ ( 𝜑 → ( ( 1 / 2 ) + ( 1 / 2 ) ) = 1 ) |
| 196 | 195 | oveq2d | ⊢ ( 𝜑 → ( ( 𝑌 / ( 2 · π ) ) + ( ( 1 / 2 ) + ( 1 / 2 ) ) ) = ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 197 | 194 196 | eqtrd | ⊢ ( 𝜑 → ( ( ( 𝑌 / ( 2 · π ) ) + ( 1 / 2 ) ) + ( 1 / 2 ) ) = ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 198 | 189 192 197 | 3eqtrd | ⊢ ( 𝜑 → ( ( 𝐵 / ( 2 · π ) ) + ( 1 / 2 ) ) = ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 199 | 198 | adantr | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝐵 / ( 2 · π ) ) + ( 1 / 2 ) ) = ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 200 | 187 199 | breqtrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) |
| 201 | btwnnz | ⊢ ( ( ( 𝑌 / ( 2 · π ) ) ∈ ℤ ∧ ( 𝑌 / ( 2 · π ) ) < ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ∧ ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) < ( ( 𝑌 / ( 2 · π ) ) + 1 ) ) → ¬ ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ∈ ℤ ) | |
| 202 | 163 186 200 201 | syl3anc | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( ( 𝑦 / ( 2 · π ) ) + ( 1 / 2 ) ) ∈ ℤ ) |
| 203 | 162 202 | eqneltrd | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( ( ( 𝑦 / 2 ) / π ) + ( 1 / 2 ) ) ∈ ℤ ) |
| 204 | coseq0 | ⊢ ( ( 𝑦 / 2 ) ∈ ℂ → ( ( cos ‘ ( 𝑦 / 2 ) ) = 0 ↔ ( ( ( 𝑦 / 2 ) / π ) + ( 1 / 2 ) ) ∈ ℤ ) ) | |
| 205 | 157 204 | syl | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( cos ‘ ( 𝑦 / 2 ) ) = 0 ↔ ( ( ( 𝑦 / 2 ) / π ) + ( 1 / 2 ) ) ∈ ℤ ) ) |
| 206 | 203 205 | mtbird | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ¬ ( cos ‘ ( 𝑦 / 2 ) ) = 0 ) |
| 207 | 206 | neqned | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( cos ‘ ( 𝑦 / 2 ) ) ≠ 0 ) |
| 208 | 161 207 | jca | ⊢ ( ( 𝜑 ∧ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ) → ( ( sin ‘ ( 𝑦 / 2 ) ) ≠ 0 ∧ ( cos ‘ ( 𝑦 / 2 ) ) ≠ 0 ) ) |
| 209 | 208 | ralrimiva | ⊢ ( 𝜑 → ∀ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ( ( sin ‘ ( 𝑦 / 2 ) ) ≠ 0 ∧ ( cos ‘ ( 𝑦 / 2 ) ) ≠ 0 ) ) |
| 210 | 22 209 | jca | ⊢ ( 𝜑 → ( 𝑌 ∈ ( 𝐴 (,) 𝐵 ) ∧ ∀ 𝑦 ∈ ( ( 𝐴 (,) 𝐵 ) ∖ { 𝑌 } ) ( ( sin ‘ ( 𝑦 / 2 ) ) ≠ 0 ∧ ( cos ‘ ( 𝑦 / 2 ) ) ≠ 0 ) ) ) |