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Massimiliano Sala edited section_Bytes_The_polynomials_in__.tex
about 6 years ago
Commit id: 1559c11a9be88415c395b935869443da8ce6f0fc
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We do that by what is called a "polynomial relation". For example, we can define the following relation $x^3=x+1$, or equivalently $x^3+x+1=0$.
With this relation in mind, any time we find a monomial of degree greater than or equal to $3$ we substitute $x^3$ with $x+1$. We iterate this substitution until we obtain a polynomial of degree strictly less than $3$. For example
\[
x^5+x \,=\, x^2(\underline{x^3})+x
\,=^{\mathrm{substitution}\, \,=^{\mathrm{substitution}}\, x^2(\underline{x+1})+x\,=\,
\underline{x^3}+x^2+x=^{\mathrm{substitution} \underline{x^3}+x^2+x=^{\mathrm{substitution}} \underline{x+1}+x^2+x \,=\, x^2+1 \,.
\]
One can obtain the same result dividing the polynomial $x^4+x^2$ by the polynomial $x^3+x+1$. The remainder is $x$.
Hence the polynomials defined in the set