Purdue University Graduate School
Purdue_Thesis.pdf (648.33 kB)

Two Problems in Applied Topology

Download (648.33 kB)
posted on 2021-07-23, 16:47 authored by Nathanael D CoxNathanael D Cox
In this thesis, we present two main results in applied topology.
In our first result, we describe an algorithm for computing a semi-algebraic description of the quotient map of a proper semi-algebraic equivalence relation given as input. The complexity of the algorithm is doubly exponential in terms of the size of the polynomials describing the semi-algebraic set and equivalence relation.
In our second result, we use the fact that homology groups of a simplicial complex are isomorphic to the space of harmonic chains of that complex to obtain a representative cycle for each homology class. We then establish stability results on the harmonic chain groups.


Degree Type

  • Doctor of Philosophy


  • Mathematics

Campus location

  • West Lafayette

Advisor/Supervisor/Committee Chair

Saugata Basu

Additional Committee Member 2

Andrei Gabrielov

Additional Committee Member 3

Hans Walter

Additional Committee Member 4

Tamal Dey