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Metascientific criteria used for explaining or constraining physical spacedimensionality and their historical relationship to prevailing causal systemsare discussed. The important contributions by Aristotle, Kant and Ehrenfest tothe dimensionality of space problem are considered and shown to be grounded ondifferent causal explanations: {\it causa materialis} for Aristotle, {\it causaefficiens} for young Kant and an ingenious combination of {\it causa efficiens}and {\it causa formalis} for Ehrenfest. The prominent and growing r\^ole playedby {\it causa formalis} in modern physical approaches to this problem isemphasized.

Causa Efficiens versus Causa Formalis: origens da discuss\~ao moderna sobre a dimensionalidade do espa\c{c}o