It is entirely phragmoconic. The ribs are straight rectiradiate and branch at the ventral shoulder to give rise to two to three secondary ribs . As the venter is somewhat eroded little detail is visible there .
The set of natural numbers with multiplication as the monoid operation (instead of addition) has multiplicative ideals, such as, for example, the set {1, 3, 9, 27, 81, ...}. If any member of it is multiplied by a number which is not a power of 3 then the result will not be a power of three.
This Digest is the result of a careful reading of every case, and not a mere scissoring of head notes, as is so often done by digesters.
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