A recursive approach (which is what I would use) would involve breaking the problem into isomorphic subproblems: to find all permutations of a string, find all permutations of the string without a ...

I have written a function to calculate the Runge-Kutta numerical approximation of the differential equation dy/dt = -2ty^2 w/ initial conditions y(0)=1 from t=0 to t=10. The function worked when I ...

Eulerian polynomials have long occupied a central role in combinatorics, encapsulating critical information about permutation statistics. In their classical formulation, these polynomials encode the ...