* Multiset membership is now expressed using set_mset rather than count. ASCII infix syntax ":#" has been discontinued.
- Expressions "count M a > 0" and similar simplify to membership
by default.
- Converting between "count M a = 0" and non-membership happens using
equations count_eq_zero_iff and not_in_iff.
- Rules count_inI and in_countE obtain facts of the form
"count M a = n" from membership.
- Rules count_in_diffI and in_diff_countE obtain facts of the form
"count M a = n + count N a" from membership on difference sets.
INCOMPATIBILITY.
This refers to 9527ff088c15.
Enjoy!
Florian
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