parallelogram

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1: 20.2 Definitions and Periodic Properties

… ►The four points $(0,\pi ,\pi +\tau \pi ,\tau \pi )$ are the vertices of the fundamental parallelogram in the $z$-plane; see Figure 20.2.1. … ►

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Figure 20.2.1: $z$-plane. Fundamental parallelogram. …

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2: 23.5 Special Lattices

… ►Then $\mathrm{\Delta }>0$ and the parallelogram with vertices at $0$, $2{\omega }_1$, $2{\omega }_1+2{\omega }_3$, $2{\omega }_3$ is a rectangle. … ►The parallelogram $0$, $2{\omega }_1$, $2{\omega }_1+2{\omega }_3$, $2{\omega }_3$ is a square, and … ►The parallelogram $0$, $2{\omega }_1-2{\omega }_3$, $2{\omega }_1$, $2{\omega }_3$, is a rhombus: see Figure 23.5.1. …

3: 1.6 Vectors and Vector-Valued Functions

… ►Area of parallelogram with vectors $𝐚$ and $𝐛$ as sides $=\Vert 𝐚\times 𝐛\Vert$. …