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A curve which intersects some straight line in an infinity of points (but for which not every point lies on this curve).

A statistical distribution such as the normal distribution which has a single "peak."

Capable of taking on exactly one possible value.

A formula whose truth table contains only false in any interpretation is called unsatisfiable.

The symbol v variously means "disjunction" (i.e., OR in logic) or "join" (for a lattice).

"Conext 21 polyhedron" is the name given here to the solid underlying the soccer ball of the 2020 Tokyo Olympic Games (held in 2021). It is implemented in the Wolfram ...

The Droz-Farny circles are a pair of circles of equal radius obtained by particular geometric constructions. The following amazing property of a triangle, first given by ...

If two perpendicular lines are drawn through the orthocenter H of any triangle, these lines intercept each side (or its extension) in two points (labeled P_(12), P_(12)^', ...

Given a triangle, extend two sides in the direction opposite their common vertex. The circle tangent to these two lines and to the other side of the triangle is called an ...

The point F at which the incircle and nine-point circle are tangent. It has triangle center function alpha=1-cos(B-C) (1) and is Kimberling center X_(11). If F is the ...