Abstract
The authors study toy p-branes from old string action, and regularize their Casimir energies by the Epstein zeta function. They obtain the special dimensions for the open (p=2, 3, 4) and closed (p=2, 3, 4, 6, 8) branes with equal sides. The upper bound of p is obtained. They also discuss the special dimensions for open and closed membranes with unequal sides. The resulting dimensions may be integers for the case of unequal sides.

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