8 two user points of view to the whole system 1 the

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& $ % Two ”User” Points of View to the Whole System (1) The TRAINs can be thought of as using the ”network” which consists of the CPs and LINEs. NETWORK = ( CPS || LINES ) \ L where L is the union of the alphabets of the LINEs. (2) The Second level of user is provided by train drivers. SY STEM = ( TRAINS k NETWORK ) \ B where B is the set of all symbols of the form req.t.m , con.t.m , ref.t.m or rel.t.m 9
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& $ % Property Verification Property 1: At no time can there be more than one train on any line. s traces ( SY STEM ) length ( s { leave.t.l, leave.t. ¯ l : t T } ) length ( s { enter.t.l, enter.t. ¯ l : t T } ) - C where C is 0 or 1 depending on whether there is or is not a train initially on l (or ¯ l ), 10
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