4 problems

Free abelian link-group conjecture. Then $L$ is welded equivalent to the unlink.

Injectivity conjecture. If two classical spatial graphs are virtually equivalent, then they are classically equivalent.

A classical spatial graph is a spatial graph represented by a classical graph diagram, and two such graphs are virtually equivalent or classically equivalent according to the virtu…

An even, degree-one Vassiliev invariant is a function $V$ on virtual knots such that $V(K_+)-V(K_-)=0$ for even crossings and $V(K+)-V(K-) e 0$ for odd crossings. Nonexistence conj…