Hi all!

In my code, I have a multivariate polynomial with a sign symbol which 
doesn't return the correct result. I.e.

The code snippet is as follows:

                              
    sage: f1=b1-a1.dot_product(x) 

a1 is a vector with values (76, 83), b1 is scalar with value 62, x is a 
vector with values (x1,x2). Thus, f1 should return **62-76 * x1-83 * x2**; 
however it returns **25*x1 + 18*x2 + 62** which is not correct.

Please note that if I use **addition** in f1 as follows:
   
                                 
    sage: f1=b1+a1.dot_product(x)
The result is correct,i.e. 76*x1 + 83*x2 + 62

 type(f1) is sage.symbolic.expression.Expression

What could the problem be? I tried to convert the symbolic expression to 
multivariate polynomial, but this didn't work either? I also though there 
might be a problem with the minus symbol in my PC but couldn't solve it  
this way either.

Thank you for your responses!
Regards,
Natassa

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