Explore the computation of Gromov-Hausdorff distances between ultrametric spaces in this 28-minute lecture by Zhengchao Wan. Delve into the concept of ultrametric spaces, understand the Gromov-Hausdorff decision problem, and learn about the theorem that forms the basis for a recursive algorithm. Examine the complexity analysis of the algorithm and discover how dynamic programming can be applied to optimize the solution. Witness a practical demonstration and engage in a Q&A session to solidify your understanding of this advanced topic in applied algebraic topology.