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2.31.3  Substraction in ℤ/pℤ or in ℤ/pℤ[x] : -

- substracts two integers in ℤ/pℤ or two polynomials in ℤ/pℤ[x]. For polynomial expressions, use the normal command to simplify.
For integers in ℤ/pℤ, input :

31%13-10%13

Output :

-5%13

For polynomials with coefficients in ℤ/pℤ, input :

normal((11*x+5)%13-(8*x+6)%13)

or also :

normal(11% 13*x+5%13-8% 13*x+6%13)

Output :

(3%13)*x+-1%13

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