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An object is amphichiral (also called reflexible) if it is superposable with its mirror image (i.e., its image in a plane mirror).

The span of an unoriented link diagram (also called the link spread) is the difference between the highest and lowest degrees of its bracket polynomial. The span is a ...

The dimension of a partially ordered set P=(X,<=) is the size of the smallest realizer of P. Equivalently, it is the smallest integer d such that P is isomorphic to a ...

The rectifiable sets include the image of any Lipschitz function f from planar domains into R^3. The full set is obtained by allowing arbitrary measurable subsets of ...

An object is reflexible if it is superposable with its image in a plane mirror. Also called amphichiral.

The third power point is the triangle center with triangle center function alpha_(32)=a^3. It is Kimberling center X_(32).

Johnson solid J_(18).

Two or more lines or line segments which are perpendicular are said to be orthogonal.

In the American system, 10^(63).

A function is a relation that uniquely associates members of one set with members of another set. More formally, a function from A to B is an object f such that every a in A ...