
strange booleanconvert behavior?
Posted:
Jul 10, 2012 12:42 AM


Dear Group: Say I have the following expression: num1={{a,b,c,d},{a,b,c,e},{a,b,c,f},{a,b,c,g},{a,b,c,h},{a,b,c,i},{a,b,c,j},{a,b,c,k},{a,b,c,l},{a,b,c,m},{a,b,c,n}}
I transform it into a logical expression: n= um2=Apply[Or,Apply[And,#]&/@num1] I want to simplify this to a CNF, and the obvious function to use is Boolean Convert. Suppose I apply it to NINE elements of num2: BooleanConvert[Take[num2,9],"CNF"] The output is a&&b&&c&&(defghijkl)
It works perfectly well!
However, if I apply BooleanConvert to the whole expression I get back a bunch of crap. Also if I apply it to 10 elements of num2. In sum, it appears that BooleanConvert only works well for 9 expressions or less. Tried this with other two examples, and found exactly the same result.
All this in Mathematica 8
Can somebody help me? Francisco

