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delta(r)=sqrt(r)-2alpha(r), where alpha(r) is the elliptic alpha function.

E(a,b)/p denotes the elliptic group modulo p whose elements are 1 and infty together with the pairs of integers (x,y) with 0<=x,y<p satisfying y^2=x^3+ax+b (mod p) (1) with a ...

A catastrophe which can occur for three control factors and two behavior axes. The elliptical umbilic is catastrophe of codimension 3 that has the equation ...

Johnson solid J_(16).

Johnson solid J_(41).

A pentagonal rotunda adjoined to a decagonal prism which is Johnson solid J_(21).

Johnson solid J_(19).

Johnson solid J_(14).

The second-order ordinary differential equation (x^2y^')^'+x^2y^n=0.

A modular form which is not allowed to have poles in the upper half-plane H or at iinfty.