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One of the three 2-polyaboloes.

A metric g_(ij) which is zero for i!=j.

A cryptarithmetic in which digits are used to represent other digits.

The number of digits D in an integer n is the number of numbers in some base (usually 10) required to represent it. The numbers 1 to 9 are therefore single digits, while the ...

The operator D=-i(d+d^*), where d^* is the adjoint.

Let the divisor function d(n) be the number of divisors of n (including n itself). For a prime p, d(p)=2. In general, sum_(k=1)^nd(k)=nlnn+(2gamma-1)n+O(n^theta), where gamma ...

If g is continuous and mu,nu>0, then int_0^t(t-xi)^(mu-1)dxiint_0^xi(xi-x)^(nu-1)g(xi,x)dx =int_0^tdxint_x^t(t-xi)^(mu-1)(xi-x)^(nu-1)g(xi,x)dxi.

A polynomial form which is the sum of two polynomial forms involving separate sets of variables.

Not continuous. A point at which a function is discontinuous is called a discontinuity, or sometimes a jump.

Johnson solid J_(90).