■e+πに収束する分数列(その13)
(その12)の続き.
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(1−x)^α=F(−α,β,β:x)
(1+x)^-α
=1//1+αx//1+(1−α)x//2+(1+α)x//3+(2−α)x//2+(2+α)x//5+(3−α)x//2+・・・
(1+x)^α+(1−x)^α=2F((1−α)/2,−α/2,1/2:x^2)
(1+x)^α−(1−x)^α=2αxF((1−α)/2,1−α/2,1+1/2:x^2)
{(1+x)^α−(1−x)^α}/{(1+x)^α+(1−x)^α}
=αx//1+(α^2−1)x^2//3+(α^2−4)x^2//5+(α^2−9)x^2//7+・・・
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