Every one of these objects can be uniquely decomposed into primes by Schubert’s theorem. Gordon and Leucke proved a theorem about determining one of these objects from their complement, which is compact when working in a 3-sphere. (15[1])Tame examples of these objects can be “framed” by a solid torus. Reidemeister moves (15[2])leave (15[1])invariant a quantity describing these objects that is built recursively from skein relations and named after six mathematicians. The HOMFLY, (*) Alexander, and Jones polynomials describe these objects. Links are unions of these objects, which are composed of tangles. Prefixing the name of these objects with “un-” gives their simplest case, which has fewer crossings than the trefoil and figure-eight examples. (10[1])For 10 points, name these embeddings in space of a tied string. ■END■