Exact algebraic m(em)brane solutions

Three classes of new, algebraic, zero-mean-curvature hypersurfaces in pseudo-Euclidean spaces are given. While everyone thinking about relativistic membrane dynamics will easily find a collapsing round sphere of radius r(t) (= some elliptic function), and perhaps (cp. [1]) (1) t− z = ( x + y R2 − 1 )