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0111 · Dec 201119922001200920172026
5 results for π1-essential

New invariants measure how far spanning surfaces are from being compressible.

problem Understanding how essential spanning surfaces are in 3-manifolds.
method Introducing algebraic and geometric essence invariants, proving plumbing respects algebraic essence, and extending results to arbitrary 3-manifolds.
result Plumbing respects the algebraic essence of spanning surfaces, extending Ozawa's theorem.

In this paper, we define finite type invariants for cyclic equivalence classes of nanophrases and construct the universal ones. Also, we identify the universal finite type invariant of degree 1 essentially with the linking matrix. It is known that extended Arnold's basic invariants to signed words are finite type invar…

2011-12-28abs ↗pdf ↗

We consider the first non-zero eigenvalue λ1λ_1 of the Laplacian on hyperbolic surfaces for which one disconnecting collar degenerates and prove that 8πlog(λ1)8π\nabla\log(λ_1) essentially agrees with the dual of the differential of the degenerating Fenchel-Nielsen length coordinate. As a consequence, we can improve previous …

2017-01-30abs ↗pdf ↗

Essential surfaces in link diagrams on surfaces are crucial for understanding link properties.

problem Understanding the essentiality of surfaces in link diagrams on surfaces.
method Proving checkerboard surfaces are π1-essential and contain no essential closed curves that are ∂-parallel.
result Checkerboard surfaces of alternating link diagrams are π1-essential and contain no essential closed curves that are ∂-parallel.