(mathematics) topology

(mathematics) study of properties in geometry based on arguments and proofs instead of intuition.

(mathematics) intuitive geometry, study of properties in geometry based on intuition, using methods such as observation, measurements, and drawing.

(physics) geometrical optics

Synonym of 黄昏 (tasogare, “dusk; twilight”) / Synonym of 黄昏時 (tasogaredoki, “dusk; twilight”)

(mathematics) geometrical

(geometry, mathematics) Euclidean geometry

(mathematics, geometry) Riemannian geometry

topology (study of geometric properties that are not changed by stretching etc.)

algebraic geometry