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We study the problem of determining the complexity of the exact weighted independent set problem , and its restricted version EWIS _ \ alpha ( where the independent set is required to be of maximum size ) , for particular graph classes . During the pseudolinear flow , and if the fluid transfer is in the transition period , a log-log graph of the pressure versus time exhibits 1/4 slope straight line . As a mean for expressing the synergy deriving from the cooperation , a particular graph grammar , called system grammar , is defined and used in NLC and BNLC context . The mathematics referred to later on ranges from basic linear algebra , through simple graph theory , to Parseval 's theorem ( mispronounced in the film ) , Fourier analysis , and on to what seem to be some deeper graph theoretical results . For example , the above graph could be viewed as a map of what cities are connected by train routes . When activity , as defined by the Standard and Poors Activity Classification , is analysed , the above graph shows that the Manufacturing and Transport related activities attracted the largest share of investment , with $ 1,172 m or 36 % of total investment in June 2002 .