Cycle spectrum

Cycle spectrum --- цикловой спектр.

For a graph [math]\displaystyle{ G }[/math], we define the cycle spectrum [math]\displaystyle{ CS(G) }[/math] of [math]\displaystyle{ G }[/math] as the sequence [math]\displaystyle{ \ell_{1} \lt \cdots \lt \ell_{r} }[/math] of lengths of cycles in [math]\displaystyle{ G }[/math].