Curtis Greene could refer to different things depending on the context. Most commonly, it might refer to a person, such as an author, academic, or public figure with that name. However, if you are referring to a specific event, place, or work associated with Curtis Greene, additional context would be necessary to provide an accurate answer.

David Conlon may refer to multiple individuals, as it is not an uncommon name. However, one notable figure by that name is a mathematician known for his work in combinatorics and related areas. He has made significant contributions to various problems in mathematics, particularly in the field of Ramsey theory.

Dominique Foata is a French mathematician known for his contributions to combinatorial mathematics and particularly to the field of combinatorial theory and enumeration. He has worked on various topics, including generating functions, combinatorial identities, and applications of combinatorics in other areas of mathematics. Foata is also recognized for his work on permutations and their properties.

Emanuel Sperner was a German mathematician known primarily for his contributions to combinatorial mathematics, particularly in the fields of topology and set theory. Born on March 23, 1905, he developed several important concepts, including Sperner's theorem, which addresses the largest family of subsets of a finite set that can be chosen so that no one set is contained within another. His work has had a significant impact on both combinatorics and other areas of mathematics.

"Discoveries" by Friedrich Karl Arnold Schwassmann is not a widely recognized work, and there seems to be limited information about it in the context of literature, science, or any other prominent field. Friedrich Karl Arnold Schwassmann was a German astronomer and physicist known primarily for his research in the fields of astronomy and astrophysics, particularly related to comets and celestial bodies.

Eric Temple Bell (1883–1960) was a Scottish-born mathematician, mathematician, and science fiction writer who made significant contributions to mathematics and its popularization. He is perhaps best known for his work in the fields of number theory, analysis, and the theory of functions. In addition to his academic work, Bell was a prolific writer and authored numerous books aimed at a general audience, making complex mathematical concepts accessible to non-specialists.

As of my last knowledge update in October 2023, Eugenia O'Reilly-Regueiro does not appear to be a widely recognized public figure, historical figure, or concept in mainstream discourse. It's possible that she is a private individual or a name that has come into prominence after my training cutoff.

Frank P. Ramsey (1903–1930) was a British mathematician, philosopher, and economist known for his contributions to various fields, including mathematics, logic, and decision theory. Despite his short life, he made significant advancements in several areas: 1. **Mathematics**: Ramsey is best known for his work in combinatorial mathematics. The Ramsey theory, which deals with conditions under which a certain order must appear in structures, is named after him.

John Riordan (1905–1982) was an American mathematician known for his work in combinatorics, generating functions, and number theory. He made significant contributions to the field, particularly in the areas of combinatorial methods and the study of special functions associated with mathematical sequences.

AVFoundation is a powerful framework provided by Apple that allows developers to work with audiovisual media in their applications. It is part of the iOS, macOS, watchOS, and tvOS SDKs and provides a range of capabilities for handling audio and video content. AVFoundation facilitates a wide variety of tasks, including: 1. **Playback**: Developers can play audio and video files, streams, and other media formats.

Heiko Harborth is a German mathematician known for his contributions to discrete mathematics, graph theory, and combinatorics. His research often focuses on topics related to graph coloring, extremal graph theory, and combinatorial algorithms. Harborth has authored and co-authored numerous papers and works in these areas, and he is recognized for his work in studying properties of graphs and their applications in various mathematical contexts.

Federico Rodriguez Hertz does not appear to be a widely recognized figure or term in public sources as of my last update in October 2023. It's possible that he could be a private individual or a lesser-known figure in a specific field. If he has gained notoriety or relevance after that date, I would not have that information.

The cutoff frequency, often denoted as \( f_c \), is a fundamental parameter in the field of signal processing and filter design. It refers to the frequency at which the output of a filter or a system begins to attenuate significantly compared to its response at lower frequencies. Typically, it marks the boundary between passband and stopband in a filter.

Hugo Hadwiger was a notable Swiss mathematician known for his contributions to several areas of mathematics, particularly in the fields of topology, geometry, and graph theory. He is perhaps best known for Hadwiger's theorem and Hadwiger's conjecture, which relate to the properties of graph colorings and the connections between different types of geometric figures. His work has had a lasting impact on mathematical research and theory.

Imre Bárány is a Hungarian mathematician known for his work in combinatorics, particularly in areas related to convex geometry and discrete geometry. He has made significant contributions to various aspects of these fields, often focusing on the interplay between combinatorial structures and geometric properties.