Henry Bushby Transcription pages
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2 arcs 3 cords. Result.
4 Crossings, not alternate,
& [Deleted: not] reducible to the
overhand S2 3b/3c
Crossings over 2 & under 2.
Note: A strip of paper given 2 half twists &
cut along 2 lines (forming 3 bands) gives
[Deleted: S3 3b/[3 corrected to 6]c not S2.] [Deleted: S3 3b/6c]^ 3 linked rings not S2 3b/3c. This is
because in twisting flat paper the central
1/3 part longitudinally must always join itself.
(But in any Sn where n is even the expected
result ought to occur? or might sometimes)
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