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An obstruction to extending isotopies of piecewise linear manifolds
Let F: M x I n -» Q x I" be an n-isotopy (not necessarily PL) of a compact PL m -manifold M in a PL q -manifold Q, and let G: QxΓ -> Q x/" be an ambient isotopy of Q which covers FonQx dΓ.If m ^ q -3 …