1. Abelian Group:

Actual Definition: An Abelian group, named after Niels Henrik Abel, is a group in which the binary operation is commutative, meaning that for all elements a and b in the group, a * b = b * a.

Etymological Definition and Derivation: The term "Abelian" pays homage to the Norwegian mathematician Niels Henrik Abel, who made significant contributions to the theory of equations and group theory. The word "Abelian" is derived from the Latin word "Abelius," signifying Abel's enduring legacy.

2. Euclidean Geometry:

Actual Definition: Euclidean geometry, introduced by the ancient Greek mathematician Euclid, is a branch of mathematics that deals with properties, relationships, and measurements of points, lines, angles, and surfaces in the plane and space, based on Euclid's five postulates.

Etymological Definition and Derivation: "Euclidean" honors the legendary Greek mathematician Euclid, a beacon of geometrical elucidation. Rooted in the Greek term "Euclides," it resonates with the man's enduring dedication to the exploration of space.

3. Calculus:

Actual Definition: Calculus is a branch of mathematics that explores the concepts of limits, derivatives, integrals, and infinite series, enabling the analysis of change and accumulation in various contexts.

Etymological Definition and Derivation: "Calculus" emerges from the Latin "calculus," a diminutive of "calx," meaning a small stone used in counting and calculations. It was birthed by minds like Newton and Leibniz, who sculpted this art of calculation to harness the elusive infinitesimal.

4. Topology:

Actual Definition: Topology is a field of mathematics that examines the properties of space that are preserved under continuous deformations, including concepts like continuity, convergence, compactness, and connectedness.

Etymological Definition and Derivation: "Topology" emerges from the Greek roots "topos" (place) and "logos" (study), a testament to the exploration of spatial relations. Its true essence resides in the intimate scrutiny of shapes' essence beyond rigid measurements.

5. Eigenvalue:

Actual Definition: In linear algebra, an eigenvalue of a matrix represents a scalar value that characterizes how a matrix transforms a vector, with the vector only scaling by the eigenvalue during the transformation.

Etymological Definition and Derivation: "Eigenvalue" springs from the German "eigen," meaning inherent or characteristic, and "value." It encapsulates the distinct nature of values that a matrix uniquely possesses, much like a signature of its intrinsic behavior.

6. Homomorphism:

Actual Definition: A homomorphism is a structure-preserving map between two algebraic structures, such as groups, rings, or vector spaces, that preserves the operations and relationships between elements.

Etymological Definition and Derivation: "Homomorphism" finds its roots in the Greek "homos" (same) and "morphē" (form). This term embodies the lofty concept of maintaining similarity, preserving the integrity of structures across mathematical realms.

7. Fractal:

Actual Definition: A fractal is a complex geometric shape or pattern that displays self-similarity at various scales, exhibiting intricate detail regardless of the level of magnification.

Etymological Definition and Derivation: "Fractal" derives from the Latin "fractus," meaning broken or fractured. Coined by Benoît B. Mandelbrot, this term encapsulates the enigmatic beauty of structures that break free from the linear constraints of Euclidean space.