[[File:cusp catastrophe.svg|thumb|upright=1.5|Diagram of cusp catastrophe, showing curves (brown, red) of ''x'' satisfying ''dV''/''dx'' = ''0'' for parameters (''a'',''b''), drawn for parameter ''b'' continuously varied, for several values of parameter ''a''.
+
[[File:cusp catastrophe.png|thumb|upright=1.5|Diagram of cusp catastrophe, showing curves (brown, red) of ''x'' satisfying ''dV''/''dx'' = ''0'' for parameters (''a'',''b''), drawn for parameter ''b'' continuously varied, for several values of parameter ''a''.
−
[[File:cusp catastrophe.svg|thumb|upright=1.5| 尖点突变图,显示 x 的曲线(棕色,红色)满足 dv / dx 0的参数(a,b) ,为参数 b 绘制的曲线连续变化,为参数 a 的几个值绘制的曲线(棕色,红色)。
+
[[File:cusp catastrophe.png|thumb|upright=1.5| 尖点突变图,显示 x 的曲线(棕色,红色)满足 dv / dx 0的参数(a,b) ,为参数 b 绘制的曲线连续变化,为参数 a 的几个值绘制的曲线(棕色,红色)。