Abstract
Series expansions are used to study the exponent delta p for site and bond percolation problems on three-dimensional lattices. The results, which include delta p=5.0+or-0.8, are discussed in relation to scaling theory and universality. To test Toulouse's conjecture (1974) regarding the critical dimensionality (dc=6) for percolation processes, a similar analysis is attempted for the site problem on simple hypercubical lattices of dimensionality 4<or=d<or=7.

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