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A surface which has no edges.

All lengths can be expressed as real numbers.

A complex polynomial is a polynomial with complex coefficients.

A vector whose elements are complex numbers.

Given a quadratic form Q(x,y)=x^2+y^2, (1) then Q(x,y)Q(x^',y^')=Q(xx^'-yy^',x^'y+xy^'), (2) since (x^2+y^2)(x^('2)+y^('2)) = (xx^'-yy^')^2+(xy^'+x^'y)^2 (3) = ...

Computer algebra is a diffuse branch of mathematics done with computers that encompasses both computational algebra and analysis.

K=-e^2, where e is the eccentricity of a conic section.

A type I Markov move.

If the consistency of one of two propositions implies the consistency of the other, the first is said to have greater consistency strength.

A topological space.