I want to plot the following equation (w-$\delta$ graph)

enter image description here

Ty Tx and ly are constant and I will assign a value for them. I am a new one on the Mathematica and can not handle this.

  • 2
    $\begingroup$ It seems that this sum cannot be found symbolically, however there is numerical sum NSum which can be computed with numerical values of constants e.g. With[{Tx = 0.6, Ty = 0.93}, NSum[(-1)^( n - 1)/(2 n - 1)^3 (1 - 1/ Cosh[(2 n - 1) Pi/(2 Tx) Sqrt[Ty/Tx]]), {n, 1, Infinity}]] $\endgroup$
    – Artes
    Mar 2 '20 at 14:09
  • $\begingroup$ Thank you. I also tried Sum[f,{n, 1, Infinity, 2}] and think it works pretty well. $\endgroup$ Mar 3 '20 at 12:26

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