Hansen Chain
An Addition Chain for which there is a Subset 
of members such that each member of the chainuses the largest element of which is less than the member.
References
Guy, R. K. ``Addition Chains. Brauer Chains. Hansen Chains.'' §C6 in Unsolved Problems in Number Theory, 2nd ed. New York: Springer-Verlag, pp. 111-113, 1994.
- Auxiliary Latitude
- Auxiliary Triangle
- Average
- Average Absolute Deviation
- Average Function
- Average Seek Time
- Semisecant
- Semisimple
- Semisimple Algebra
- Semisimple Lie Group
- Semisimple Ring
- Semistable
- Sensitivity
- Sentence
- Separating Edge
- Separating Family
- Separation
- Separation of Variables
- Separation Theorem
- Separatrix
- Septendecillion
- Septillion
- Sequence
- Sequency
- Sequency Function