Abstract
The aim of this paper is to make sense of Hamada's formula for the dimension of the code generated by the incidence matrix of points and subspaces of a given dimension in a finite projective space. The known results are surveyed and a successful guess is made for the dimension of the dual line code when the field has prime order. Van Lint's proof of the equivalence of the two formulas is given. A further guess on the meaning of the formula is also made and a simple proof due to Glynn is given.
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