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Suma de la serie (ln(x)^n)*(x-exp(x))/(n-exp(x))



=

Solución

Ha introducido [src]
  oo                  
____                  
\   `                 
 \       n    /     x\
  \   log (x)*\x - e /
   )  ----------------
  /             x     
 /         n - e      
/___,                 
n = 1                 
$$\sum_{n=1}^{\infty} \frac{\left(x - e^{x}\right) \log{\left(x \right)}^{n}}{n - e^{x}}$$
Sum((log(x)^n*(x - exp(x)))/(n - exp(x)), (n, 1, oo))
Respuesta [src]
  //        /                x\                /      -1       \\   //        /                x\                /      -1       \\   
  ||lerchphi\log(x), 1, 1 - e /*log(x)  for And\x >= e  , x < E/|   ||lerchphi\log(x), 1, 1 - e /*log(x)  for And\x >= e  , x < E/|   
  ||                                                            |   ||                                                            |   
  ||            oo                                              |   ||            oo                                              |   
  ||          ____                                              |   ||          ____                                              |   
  ||          \   `                                             |   ||          \   `                                             |  x
x*|<           \       n                                        | - |<           \       n                                        |*e 
  ||            \   log (x)                                     |   ||            \   log (x)                                     |   
  ||             )  -------                    otherwise        |   ||             )  -------                    otherwise        |   
  ||            /         x                                     |   ||            /         x                                     |   
  ||           /     n - e                                      |   ||           /     n - e                                      |   
  ||          /___,                                             |   ||          /___,                                             |   
  \\          n = 1                                             /   \\          n = 1                                             /   
$$x \left(\begin{cases} \Phi\left(\log{\left(x \right)}, 1, 1 - e^{x}\right) \log{\left(x \right)} & \text{for}\: x \geq e^{-1} \wedge x < e \\\sum_{n=1}^{\infty} \frac{\log{\left(x \right)}^{n}}{n - e^{x}} & \text{otherwise} \end{cases}\right) - \left(\begin{cases} \Phi\left(\log{\left(x \right)}, 1, 1 - e^{x}\right) \log{\left(x \right)} & \text{for}\: x \geq e^{-1} \wedge x < e \\\sum_{n=1}^{\infty} \frac{\log{\left(x \right)}^{n}}{n - e^{x}} & \text{otherwise} \end{cases}\right) e^{x}$$
x*Piecewise((lerchphi(log(x), 1, 1 - exp(x))*log(x), (x < E)∧(x >= exp(-1))), (Sum(log(x)^n/(n - exp(x)), (n, 1, oo)), True)) - Piecewise((lerchphi(log(x), 1, 1 - exp(x))*log(x), (x < E)∧(x >= exp(-1))), (Sum(log(x)^n/(n - exp(x)), (n, 1, oo)), True))*exp(x)

    Ejemplos de hallazgo de la suma de la serie