### The Big Idea

Persistent homology can identify significant topological features of data.
In this context, *data* usually means a cloud of points, often representing measurements of some object, and possibly occurring in a high-dimensional space.
*Topological features* include clusters, loops, and voids.
*Homology* is a powerful mathematical tool that identifies topological features.

In the usual setting, data is indexed by a single parameter, such as *time*.
Suppose that any fixed time value determines a particular configuration of data, for which homology can be computed.
In this case, persistent homology is able to detect topological features of the data that persist over long intervals of time.
Persistence information can be expressed algebraically in a *persistence module*, or graphically in a *persistence diagram* or *barcode*.

### Multidimensional Persistence

My work involves the computation and visualization of multidimensional persistent homology.
Often, data is indexed not by a single parameter, but by multiple parameters, such as *time and distance*.
In this case, understanding and visualizing persistent homology is much more complicated than in the one-dimensional setting.
Michael Lesnick and I have developed algorithms and software to efficiently compute and visualize two-dimensional persistent homology.
Our software, RIVET, is available now, along with a paper about our algorithms.

### Want to read more?

- Robert Ghrist has an award-winning survey paper on persistent homology: Barcodes: The Persistent Topology of Data.
- See my list of papers.

### Software

RIVET, the Rank Invariant Visualization and Investigation Tool, is available now. See the RIVET site or the RIVET GitHub page.