convex curves
... that after Archimedes first defined convex curves, mathematicians lost interest in their analysis until the 19th century, more than two millennia later?
... that after <a href="./Archimedes" id="mwAqY" rel="mw:WikiLink" title="Archimedes">Archimedes</a> first defined <b id="mwAqc"><a href="./Convex_curve" id="mwAqg" rel="mw:WikiLink" title="Convex curve">convex curves</a></b>, mathematicians lost interest in their analysis until the 19th century, more than two millennia later?