Disappearing Worksheet

Hi All,

Try the disappearing worksheet trick,

From the help menu lsolve() is supposed to work on complex variables

Solving Linear Systems
•lsolve(M, v)—Returns the solution x for the linear system of equations M·x = v, using LU factorization.
Arguments
•M is a real or complex matrix. If the matrix is square, it must be nonsingular.
•v is a real or complex vector or matrix having the same number of rows as M.

See the enclosed sheet just before the crash.  put an evaluation equal sign after lsolve(A,b) and presto Prime vanishes with no warning or error.