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Explicit expressions for the determinants of twenty particular n-square matrices are given. 1. Introduction. A few years ago one of the authors (3) obtained explicit expres- sions for the determinants of certain particular n-square matrices by either de- composing these matrices into triangular factors or by transforming them into matrices whose determinants are well known. These operations were effected mainly by pre- or postmultiplications of the given matrix by specially constructed triangular matrices, so that certain summation theorems from the theory of generalized hypergeometric functions could be utilized. Some interest was aroused by this method at the time, and it was thought that a systematic use of the many well-known summation theorems from the theory of generalized hypergeometric functions would lead to the explicit evaluation of determinants of a very general class of matrices. Unfortunately this does not seem to be the case. A search for a few very general theorems concluded with a collection of particular results. While it is true that the expressions obtained in certain cases are remarkable, it is also true that, to borrow a phrase from the preface of John Riordan's latest book (4), they "seem to lose whatever memorable character they have by the pro- fusion that surrounds them." It must also be said that the forms of the results are unpredictable and there seems to be no obvious criterion for their classification and no limit to their number, since one known result usually leads to another. We would like to record here the expressions for the determinants of twenty particular matrices. Unfortunately lack of space prevents us from giving the details of the straightforward but rather lengthy manipulations involved. For convenience we have listed three known results, numbers (2.3), (2.11) with q = 1, and (2.20), and

Explicit expressions for the determinants of certain matrices