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As Einstein said, see \eqrefeq:einstein.

\beginequation f(x) = x^2 \labeleq:square \endequation autonum.info

On first compile, both equations may appear numbered. On the , autonum reads the .aux file, sees that eq:einstein is referenced, and keeps its number. The Pythagorean equation remains unreferenced, so its number disappears. 3.3 With align and cleveref \documentclassarticle \usepackageamsmath, cleveref \usepackageautonum \begindocument As Einstein said, see \eqrefeq:einstein

\enddocument

% This equation will NOT be numbered (no reference) \beginequation a^2 + b^2 = c^2 \endequation As Einstein said

autonum is often preferred over mathtools ’ showonlyrefs because autonum works with more environments and handles \label placement more robustly. \documentclassarticle \usepackageamsmath \usepackage[colorlinks]hyperref \usepackagecleveref \usepackageautonum \begindocument

\beginequation g(x) = \sqrtx \labeleq:root \endequation