
  eval - Evaluates an expression in the current state.
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   eval [-h] ctl-expression
   
   Evaluates ctl-expression in the _current state_. Since we deal with
   CTL formulae, the evaluation activates the model checking algorithms,
   and can produce a new trace starting from _current state_, to be used
   by later commands. If additional traces are created from state _n.i_,
   they are numbered _t+1, t+2, t+3, ..._, where _t_ is the number
   corresponding to the last trace generated. Within these traces, the
   states are numbered _(t+i).1, (t+i).2, (t+i).3, ..._.
   
   Command options:
   
   ctl-expression
          The CTL formula to be evaluated.
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   Last updated on 990119 20h08
