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A quadratic form Q(z) is said to be positive definite if Q(z)>0 for z!=0. A real quadratic form in n variables is positive definite iff its canonical form is ...

A tensor g whose discriminant satisfies g=g_(11)g_(22)-g_(12)^2>0.

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

An operator in logic which returns either true or false.

Predictability at a time tau in the future is defined by (R(x(t),x(t+tau)))/(H(x(t))), and linear predictability by (L(x(t),x(t+tau)))/(H(x(t))), where R and L are the ...

A prime field is a finite field GF(p) for p is prime.

An n-manifold which cannot be "nontrivially" decomposed into other n-manifolds.

The symbol p^e∥n means, for p a prime, that p^e|n, but p^(e+1)n.

A group that has a primitive group action.

If B superset A (B is a superset of A), then P(A)<=P(B).