Definition: In mathematics, an "evanescent" or "vanishing" quantity is one that does not actually vanish but remains constant over time. This means that as time progresses, the quantity either remains constant (e.g., 1/2) or disappears completely (e.g., 0). For example: - The number pi (π) is an evanescent quantity because it doesn't change in value even when we measure it with a precision of about 3.141
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