Changes

Changes from Mercurial (hg https://foss.heptapod.net/isa-afp/afp-devel/ default)

Summary

  1. avoid the surprise that n-m is 0 even if n<m.
Changeset 12893:126a0ee1b713 by nipkow:
avoid the surprise that n-m is 0 even if n&lt;m.
The file was modifiedthys/Amortized_Complexity/Amortized_Framework0.thy