User Portlet User Portlet

Discussions
For a general constant linear 2nd Order pde, like DSolve[x''[t] + a x'[t] + b x[t] == 0, x[t], t] the result gives {{x[t] -> E^(1/2 (-a - Sqrt[a^2 - 4 b]) t) C[1] + E^(1/2 (-a + Sqrt[a^2 - 4 b]) t) C[2]}} where the...