Time-stamp: <2014-12-19 14:23:00 user>

licensed under the GFDL.

Change Log
+ 2014-12-19  NUMATA, Yasuhide <nu+y ___ math.shinshu-u.ac.jp>
  - add memoization. version 2014-12-19 14:22:34.

+ 2014-05-11  NUMATA, Yasuhide <nu+y ___ math.shinshu-u.ac.jp>
  - add dedication and section on naming. version: 2014-05-11 15:17:13.

+ 2014-05-10  NUMATA, Yasuhide <nu+y ___ math.shinshu-u.ac.jp>
  - fix typo. version: 2014-05-10 13:53:12.

+ 2014-04-14  NUMATA, Yasuhide <nu+y ___ math.shinshu-u.ac.jp>
  - add some figures. version: 2014-04-14 15:56:43.

+ 2012-05-13  NUMATA, Yasuhide <numata ___ stat.t.u-tokyo.ac.jp>
  - initial release. version: 2012-05-13 13:50:52.