Polytopes arise naturally when modelling fundamental structures in Biology such as RNA and proteins [1,2]. Recently, it occurred to me that a complexity measure on the topology of polytopes might be useful. To be precise, I am referring to polyhedra and their higher-dimensional analogues. Might mathematicians have developed such a concept? One idea that occurred to me was to use the number of Hamiltonian cycles. If the polytope is embedded in $\mathbb{R}^3$ this allows us to ask questions such as how many polytopes with distinct topology with $n$ vertices have less than $\lambda n!$ Hamiltonian cycles where $\lambda \in [0,1]$. Another way of approaching this might be to think about compression algorithms and Kolmogorov Complexity. However, I haven't found much work applying notions of algorithmic complexity to problems in topology. ## Addendum: [Ginestra Bianconi](http://www.maths.qmul.ac.uk/~gbianconi/index.html) and Kartik Anand have formulated a more general problem: the challenge of defining an entropy measure for complex networks [3]. This problem is motivated in [3] as follows: > Following ten years of active research in the field of complex > networks, the state of the art includes, a deep understanding of their > evolution , an unveiling of the rich interplay between network > topology and dynamics and a description of networks through > structural characteristics. Nevertheless, we still lack the > means to quantify, how *complex* is a complex network. In order to > answer this question we need a new theory of information of complex > networks. ## References: 1. Elizabeth Drellich, Andrew Gainer-Dewar, Heather A. Harrington, Qijun He, Christine Heitsch, AND Svetlana Poznanovic. Geometric Combinatorics AND Computational Molecular biology: branching polytopes for RNA sequences. 2016. 2. Paul M. Dodda, Pablo F. Damascenob and Sharon C. Glotzera. Universal folding pathways of polyhedron nets. PNAS. 2018. 3. Kartik Anand & Ginestra Bianconi. Entropy measures for networks: Toward an information theory of complex topologies. Arxiv. 2009. 4. Ginestra Bianconi. The entropy of network ensembles. Arxiv. 2008.