Online Algebra Calculator
Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only. To do this job, it is not useful to download the whole application from a web site.
Function: maybe (<expr>) Attempts to determine whether the predicate <expr> is provable from the facts in the assume database.

If the predicate is provably true or false, maybe returns true or false, respectively. Otherwise, maybe returns unknown.
maybe is functionally equivalent to is with prederror: false, but the result is computed without actually assigning a value to prederror.
See also assume, facts, and is.
Examples:
(%i1) maybe (x > 0);
(%o1) unknown
(%i2) assume (x > 1);
(%o2) [x > 1]
(%i3) maybe (x > 0);
(%o3) true(%o1) true (%i2)