Create a Power atom
power(x, p, max_denom = 1024L, approx = TRUE)A Power or PowerApprox atom, or an exp expression for the const-base case.
An Expression (the base), OR a positive constant if p is a
variable (the identity b^x = exp(x * log(b)) is used).
Numeric exponent, Parameter, or Expression. If p is a
non-constant Expression and x is a positive constant, dispatches to
exp(p * log(x)).
Maximum denominator for rational approximation
If TRUE (default), use SOC approximation. If FALSE, use exact power cone.