power::expand_add: Fix typo.
const size_t m = a.nops();
exvector result;
// The number of terms will be the number of combinatorial compositions,
const size_t m = a.nops();
exvector result;
// The number of terms will be the number of combinatorial compositions,
- // i.e. the number of unordered arrangement of m nonnegative integers
+ // i.e. the number of unordered arrangements of m nonnegative integers
// which sum up to n. It is frequently written as C_n(m) and directly
// related with binomial coefficients:
result.reserve(binomial(numeric(n+m-1), numeric(m-1)).to_int());
// which sum up to n. It is frequently written as C_n(m) and directly
// related with binomial coefficients:
result.reserve(binomial(numeric(n+m-1), numeric(m-1)).to_int());