Given a differentiable real function $y=f(x)$, is there a math concept/terminology already defined for $$\frac{f'(x)}{f(x)/x}?$$
This quantity is inspired from price elasticity of demand.
Thanks.
2026-03-31 19:15:06.1774984506
Is there a concept already for $\frac{f'(x)}{f(x)/x}$?
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Google Books and Scholar attest that this is sometimes called the dimensionless logarithmic derivative of $f$, as it is a dimensionless version of the better-known logarithmic derivative.