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A "line" having imaginary coefficients in its equations which can arise in algebraic geometry.

S_n=sum_(i)eta_imu(E_i), where mu(E_i) is the measure of the set E_i of points on the x-axis for which f(x) approx eta_i.

The relationship x precedes y is written x≺y. The relation x precedes or is equal to y is written x<=y.

In the American system, 10^(45).

The tensor defined by T^l_(jk)=-(Gamma^l_(jk)-Gamma^l_(kj)), where Gamma^l_(jk) are Christoffel symbols of the first kind.

The point at which a curve or function crosses the x-axis (i.e., when y=0 in two dimensions).

The point at which a curve or function crosses the y-axis (i.e., when x=0 in two dimensions).

The five of Hilbert's axioms which concern geometric equivalence.

The third-order ordinary differential equation y^(''')+alphayy^('')+beta(1-y^('2))=0.

The eight of Hilbert's axioms which concern collinearity and intersection; they include the first four of Euclid's postulates.