At 18:03 08.09.02, Roger D. Key wrote:
The original formulation was 6 elements/5 groups. The later version
replaced elements 2 and 3 (a cemented group) with a single element, giving
5elements/4 groups. The shape of the single element appears to be identical
with the double element of the original version.
Something's wrong here: Replacing a group or (parts of a group) with a
single element can never reduce the number of groups. The result would
rather be 5/5.
Thomas Bryhn
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