Eulerrelated

Eulerrelated is an informal descriptor used in mathematics and related fields to indicate topics, theorems, formulas, or objects that are named after or closely connected with the Swiss mathematician Leonhard Euler (1707–1783). It is not a formal mathematical term but appears in bibliographies, lecture slides, and online tagging to group materials associated with Euler's work.

Representative Eulerrelated topics include Euler's formula e^{iθ} = cos θ + i sin θ; Euler's polyhedron formula V − E + F = 2; Euler characteristic χ; Euler angles for describing 3D rotations; Eulerian graphs and Eulerian trails; Euler's totient function φ(n); the Euler method for numerical integration; and the Euler-Lagrange equation in the calculus of variations.

In scholarly practice, Eulerrelated is used as a keyword or tag to indicate Eulerian lineage rather than a strict mathematical predicate. It helps researchers locate material connected to Euler's theories across disciplines, including geometry, topology, number theory, analysis, graph theory, and mechanics.