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Abstract. The first part of the paper simplifies proofs of some basic theorems of the original paper [4]. The second part presents a general method for constructing dual discriminator varieties with $2^{\aleph_0}$ subvarieties, in contrast to the complicated single variety given in [1].
AMS Subject Classification
(1991): 08B10, 08A30
Keyword(s):
Varieties,
filtrality,
dual discriminators,
definable principal congruences
Received August 15, 1995 and in revised form June 22, 1998. (Registered under 3298/2009.)
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