论文标题
自由组的自由组不变。
A free-group valued invariant of free knots
论文作者
论文摘要
本文的目的是构建一系列自由组的自由结（平面虚拟结，虚拟结）（以及循环基团的免费产品）。 （纠正了一些小错误）
The aim of the present paper is to construct series of invariants of free knots (flat virtual knots, virtual knots) valued in free groups (and also free products of cyclic groups). (Some minor mistakes are corrected)
