My friend is studying a subject called 'Numerical Mathematics and Computer Algorithms'. Surely mathematics is all about 'Numbers', so is ''Numerical Mathematics' a redundant statement?
Please excuse my ignorance.
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As @Charles said in a comment above:
I would say that only a small part of math deals with numbers, and certainly wouldn't consider either topology or algebra (group theory, field theory, etc.) as being about numbers at all. There are applications of, say, group theory to numbers -- algebraic number theory, for example -- but that doesn't make group theory itself about them.
So the term is not redundant. Specifically, the term refers to a specific field of mathematics:
Numerical mathematics is the branch of mathematics that proposes, develops, analyzes and applies methods from scientific computing to several fields including analysis, linear algebra, geometry, approximation theory, functional equations, optimization and differential equations. Other disciplines, such as physics, the natural and biological sciences, engineering, and economics and the financial sciences frequently give rise to problems that need scientific computing for their solutions.
A more concise definition is:
(Mathematics) a branch of mathematics concerned with methods, usually iterative, for obtaining solutions to problems by means of a computer