伸開線 (しんかいせん) Japanese meaning | KotomoraMeanings
1
noun
involute
rare termmathematics
Rare mathematical term for the curve traced by a point on a taut string unwinding from another curve. The loanword インボリュート is the usual modern term.
See also: インボリュート
In this old mathematics book, the notation 伸開線 is used.
