It depends on who "he" is (or was).
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brahmagupta's contribution to mathematics
Plato's contribution to geometry was talking about how geometrical diagrams were imperfect imitations of the perfect mathematical objects that they represent. He felt that mathematics provided the perfect training for the mind.
MATHEMATICS
Continuity in mathematics is the first derivative equal to zero or the Boundary condition.
The "grandfather of mathematics" is often considered to be the ancient Greek mathematician Euclid. Euclid is known for his work "Elements," a mathematical and geometric treatise that has had a profound influence on the development of mathematics. His systematic approach to geometry and his emphasis on logical reasoning laid the foundation for much of modern mathematics.