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A vector field is a section of its tangent bundle, meaning that to every point x in a manifold M, a vector X(x) in T_xM is associated, where T_x is the tangent space.

The problem of finding the curve down which a bead placed anywhere will fall to the bottom in the same amount of time. The solution is a cycloid, a fact first discovered and ...

An alternative spelling of the name "Chebyshev."

A technique is a specific method of performing an operation. The terms algorithm, method, and procedure are also used interchangeably.

A sum in which subsequent terms cancel each other, leaving only initial and final terms. For example, S = sum_(i=1)^(n-1)(a_i-a_(i+1)) (1) = ...

One of the 14 4-polyaboloes.

A set of four, also called a quartet.

The three 3-polyiamonds are called tetriamonds.

Q is said to be tightly embedded if |Q intersection Q^g| is odd for all g in G-N_G(Q), where N_G(Q) is the normalizer of Q in G.

A function defined for all possible input values.