MODULAR _ _ _ _ _ _ _ _ _ _ _ _ switch

When modular is on, polynomial coefficients are reduced by the modulus set by setmod. If no modulus has been set, modular has no effect.

examples:

setmod 2; 

  1 


on modular; 

(x+y)**2; 

   2    2
  X  + Y  


145*x**2 + 20*x**3 + 17 + 15*x*y;
			 


   2
  X  + X*Y + 1

Modular operations are only conducted on the coefficients, not the exponents. The modulus is not restricted to being prime. When the modulus is prime, division by a number not relatively prime to the modulus results in a <Zero divisor> error message. When the modulus is a composite number, division by a power of the modulus results in an error message, but division by an integer which is a factor of the modulus does not. The representation of modular number can be influenced by balanced_mod.