Kathy Horadam is not a widely known public figure, celebrity, or event as of my last knowledge update in October 2023. It is possible that she could be a private individual or a person who has gained prominence after that time. If you have more specific information or context about her, I might be able to help better.

Katz centrality is a measure of the relative influence of a node within a network. It extends the concept of degree centrality by considering not just the immediate connections (i.e., the direct neighbors of a node) but also the broader network, taking into account the influence of nodes that are connected to a node's neighbors. The fundamental idea behind Katz centrality is that a node is considered important not only because it has many direct connections but also because its connections lead to other connected nodes.

In category theory, the concept of a kernel generalizes the notion of the kernel of a homomorphism from algebra, particularly in the context of abelian groups or modules. The kernel of a morphism captures the idea of elements that are mapped to a "zero-like" object, allowing us to understand concepts like exact sequences and the structure of morphisms more broadly.

Digital Signal Processing (DSP) is a field of study and a set of techniques used to manipulate, analyze, and transform signals that have been converted into a digital format. Signals can be any physical quantity that carries information, such as sound, images, and sensor data. When these signals are processed in their digital form, computational methods can achieve significant enhancements and modifications that are often not possible or practical with analog processing.

Dirk Jan Struik was a Dutch-American mathematician and a prominent figure in the field of mathematics, particularly known for his work in topology and contributions to mathematical education. Born on December 24, 1894, in the Netherlands, he became an influential mathematician during the 20th century. Struik was also noted for his political views and involvement in leftist politics.

John Rainwater is not a widely recognized figure or concept that I have specific information on as of my last update in October 2023. It's possible that you are referring to a person, business, or concept that may not have been well-documented or that has emerged recently.