## Quick Reference

A function defined on the complex plane for which *f*(*z*)=*f*(*z*+*a*)=*f*(*z*+*b*) where *a*/*b* is not real. From this it follows that *f*(*z*+*ma*+*nb*)=*f*(*z*) for all integers *m, n* and that the function is periodic in two distinct directions on the complex plane.

*Subjects:*
Mathematics.

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