logarithm of an expression
either formal power series, or polynomial, or function that is acceptable for power series function evalpow
The function powlog(p) returns the formal power series that is the natural logarithm of p.
The power series p must have a nonzero first term (p⁡0≠0) for its logarithm to be well-defined.
The command with(powseries,powlog) allows the use of the abbreviated form of this command.
t ≔ powpoly⁡1+x,x:
s ≔ powlog⁡t:
u ≔ powlog⁡powdiff⁡powexp⁡x:
v ≔ powlog⁡powadd⁡powpoly⁡1+x,x,powexp⁡x:
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