Diameter ( $diam (S)$ )

The diameter of a subset

S

of a metric space is

diam (S) = sup {d (x, y) : x, y \in S} .

The diameter of a nonempty subset

S

of a metric space is

diam (S) = sup {d (x, y) : x, y \in S}

. For a Euclidean circle it is the longest chord length; the same definition applies to arbitrary metric subsets.

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Diameter is a protocol designed for authentication, authorization, and accounting (AAA) in computer networks. It is an evolution of the older RADIUS (Remote Authentication Dial-In User Service) protocol. Diameter offers several enhancements and improvements over RADIUS, making it more suitable for managing AAA needs in modern networks, especially in environments like telecommunications and mobile networks.

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Ciro Santilli  40 Updated 2025-07-16

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