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A surface possessing a saddle point.

A position in a game is safe for a player A if the person who plays next (player B) will lose.

A point at which two noncrossing branches of a curve meet with different tangents.

The word saltus has two different meanings: either a jump or an oscillation of a function.

The study of sampling

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

The modular equation of degree five can be written (u/v)^3+(v/u)^3=2(u^2v^2-1/(u^2v^2)).

S(nu,z) = int_0^infty(1+t)^(-nu)e^(-zt)dt (1) = z^(nu-1)e^zint_z^inftyu^(-nu)e^(-u)du (2) = z^(nu/2-1)e^(z/2)W_(-nu/2,(1-nu)/2)(z), (3) where W_(k,m)(z) is the Whittaker ...

Schmidt (1993) proposed the problem of determining if for any integer r>=2, the sequence of numbers {c_k^((r))}_(k=1)^infty defined by the binomial sums sum_(k=0)^n(n; ...

A space-filling function.