Issue No.12 - December (1971 vol.20)
A recent definition of Walsh functions is not new. An earlier version contains a proof that the above-mentioned note lacks.
Rademacher functions, sequency, Walsh functions.
J.W. Carl, "Comments on "A Simplified Definition of Walsh Functions"", IEEE Transactions on Computers, vol.20, no. 12, pp. 1617, December 1971, doi:10.1109/T-C.1971.223189