positivity improvements suggested by tryAtEachStep#4
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| -- One strictly positive term implies the whole sum is positive. | ||
| simpa using hsumRe.tsum_pos hnonneg 1 hpos1 | ||
| (24 : ℝ) * (n : ℝ) * (σ 1 n : ℝ) * Real.exp (-2 * Real.pi * (n : ℝ) * t) := | ||
| Summable.tsum_pos hsumRe (fun i ↦ by positivity) 1 (by positivity) |
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Saves a bunch of lines of code, and in a bunch of cases avoids using
nlinarith, which is slow.