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A sequence {a_1,a_2,...} for which a_1>=a_2>=....

The difference of two numbers n_1 and n_2 is n_1-n_2, where the minus sign denotes subtraction.

Two quantities y and x are said to be directly proportional, proportional, or "in direct proportion" if y is given by a constant multiple of x, i.e., y=cx for c a constant. ...

A mathematical object invented to solve irreducible congruences of the form F(x)=0 (mod p), where p is prime.

The double-struck capital letter I, I, is a symbol sometimes used instead of Z for the ring of integers. In contrast, the lower case symbol i is used to refer to the ...

An operator A^~ such that A^~^2=A^~ or an element of an algebra x such that x^2=x.

A divisor which is not a proper divisor.

For a sequence {a_n}, if a_(n+1)-a_n>0 for n>=x, then a_n is increasing for n>=x. Conversely, if a_(n+1)-a_n<0 for n>=x, then a_n is decreasing for n>=x. If a_n>0 and ...

Two quantities y and x are said to be inversely proportional (or "in inverse proportion") if y is given by a constant multiple of 1/x, i.e., y=c/x for c a constant. This ...

A conjecture concerning primes.