e/K-equivalence

Information
has gloss	eng: In mathematics, \mathcalK}-equivalence, or contact equivalence, is an equivalence relation between map germs. It was introduced by John Mather in his seminal work in Singularity theory in the 1970s as a technical tool for studying stable maps. Since then it has proved important in its own right. Roughly speaking, two map germs f,g are \scriptstyle\mathcalK}-equivalent if f−1(0) and g−1(0) are diffeomorphic.
lexicalization	eng: K-equivalence
instance of	e/Ƒ(x)