Half-period ratio

In mathematics, the half-period ratio τ of an elliptic function is the ratio of the two half-periods

[1] Quite often in the literature, ω1 and ω2 are defined to be the periods of an elliptic function rather than its half-periods.

Note that the half-period ratio can be thought of as a simple number, namely, one of the parameters to elliptic functions, or it can be thought of as a function itself, because the half periods can be given in terms of the elliptic modulus or in terms of the nome.

See the pages on quarter period and elliptic integrals for additional definitions and relations on the arguments and parameters to elliptic functions.

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