Felmer

Felmer, in the context of mathematics, specifically combinatorics and graph theory, can refer to a mathematician or to a particular type of problem involving arrangements or selections. It is most closely associated with Walter Felmer, a mathematician known for his contributions to these fields.

In a broader sense, a "Felmer problem" may informally denote a combinatorial challenge or puzzle requiring ingenuity to solve. It doesn't necessarily refer to a formally defined problem within a specific mathematical paper or publication, but rather a style of problem reminiscent of the kind Felmer might have worked on. These problems often involve constraints, optimizations, or unexpected patterns. The term's usage, however, is not rigorously standardized and may vary depending on the mathematical community involved. While not widely recognized as a formal term within established mathematical literature, "Felmer" serves as an informal descriptor among some mathematicians to indicate a challenging combinatorial problem.