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- $\closedint a b$
- $\hointr a b$
- $\hointl a b$
- $\openint a b$
be a real interval.
The difference $b - a$ between the endpoints is called the length of the interval.
- 1970: Arne Broman: Introduction to Partial Differential Equations ... (previous) ... (next): Chapter $1$: Fourier Series: $1.1$ Basic Concepts: $1.1.1$ Definitions