Tally + Tally -- union of tallies

Tally + Tally -- union of tallies

Synopsis:

Operator: + -- a binary operator

Input:

an instance of class Tally.

Output:

an instance of class Tally.

x + y -- produces the union of two tallies.

One of the arguments may be a Set.

i1 : x = tally {a,a,a,b,b,c}



o1 = Tally{a => 3}

           b => 2

           c => 1



o1 : Tally

i2 : y = tally {b,c,c,d,d,d}



o2 = Tally{b => 1}

           c => 2

           d => 3



o2 : Tally

i3 : x + y



o3 = Tally{a => 3}

           b => 3

           c => 3

           d => 3



o3 : Tally

See also:

Tally -- the class of all tally results

tally -- tally the elements of a list

Code:

     -- ../../../Macaulay2/m2/set.m2:23
     Tally + Tally := Tally => (x,y) -> merge(x,y,plus)