Not Belongs to set

Question

I have 3 set , I want to know what element not belong to Symmetric difference set.

Set1={1*125}

Set2={20*450}

Set3={45*235}

I show the symmetric difference of setA and set B by SymAB.

I calculate sym12,sym13,sym23. I have one if statement, like this ( if element x is not belong to symAB then display x)

How can I code this conditional statement?

Best

score 1 · Accepted Answer · answered Sep 24 '18 at 07:27

You cannot display just parts of a symbol. You can just use a condition to define, if you want to show a symbol or not, see also here: How Display some of 2 dimension parameter?

What you could do in your case is to define a symbol with all elements, which are not in the other symbol and display it, if it is not empty, like this:

Set x            /1*4/
    symAB        /2,4/
    notSymAB(x);
notSymAB(x) = not SymAB(x);
Display$(card(notSymAB)>0) notSymAB;

Not Belongs to set

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