Binomial series for (1+x)^α, |x|<1 (Same falling-factorial pattern; α any real; converges for |x|<1)

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Same falling-factorial pattern; α any real; converges for |x|<1

What each symbol means

SymbolWhat it stands for
xReal/complex with |x|<1
αReal index

When to use this

Standard real power series; |x|<1 for convergence (endpoint care separately).