DLMF:5.4.E18 (Q2056): Difference between revisions

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Language	Label	Description	Also known as
English	DLMF:5.4.E18	No description defined

Statements

Defining formula

{\displaystyle{\displaystyle\Im\psi\left(1+iy\right)=-\frac{1}{2y}+\frac{\pi}{% 2}\coth\left(\pi y\right).}}

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DLMF:5.4.E18

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the ratio of the circumference of a circle to its diameter

Defining formula

{\displaystyle{\displaystyle\pi}}

C3.S12.E1.m2aidec

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psi (or digamma) function

Defining formula

{\displaystyle{\displaystyle\psi\left(\NVar{z}\right)}}

C5.S2.E2.m2afdec

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hyperbolic cotangent function

Defining formula

{\displaystyle{\displaystyle\coth\NVar{z}}}

C4.S28.E7.m2aadec

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Defining formula

{\displaystyle{\displaystyle\Im}}

C1.S9.E2.m2abdec

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Sitelinks

Wikipedia(0 entries)

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