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The appropriate notion of integer for surreal numbers.

A geometry constructed without reference to measurement. The only primitive concepts are those of points and intermediacy. There are 10 axioms underlying ordered geometry.

Two (or more) intersecting curves that are perpendicular at their intersection are said to be orthogonal.

A partial function is a function that is not total.

A distribution with kurtosis excess gamma_2<0, and therefore having a flattened shape.

An operator in logic which returns either true or false.

A formula is called satisfiable if it takes at least one true value in some interpretation.

The general type of homology which is what mathematicians generally mean when they say "homology." Singular homology is a more general version than Poincaré's original ...

A tangent point of two similar curves.

A function defined for all possible input values.