文摘
Let 815&_mathId=si3.gif&_user=111111111&_pii=S0747717116300815&_rdoc=1&_issn=07477171&md5=82b172a5e918167a31cbd9b302dc0f44" title="Click to view the MathML source">f1,…,fs be formal power series (respectively polynomials) in the variable x . We study the semigroup of orders of the formal series in the algebra 815&_mathId=si4.gif&_user=111111111&_pii=S0747717116300815&_rdoc=1&_issn=07477171&md5=cab5b01ecf114a6a71341ec208b6da15" title="Click to view the MathML source">K〚f1,…,fs〛⊆K〚x〛 (respectively the semigroup of degrees of polynomials in 815&_mathId=si5.gif&_user=111111111&_pii=S0747717116300815&_rdoc=1&_issn=07477171&md5=d4ded970ba9bd1636a69de1e3fb3c72a" title="Click to view the MathML source">K[f1,…,fs]⊆K[x]). We give procedures to compute these semigroups and several applications. We prove in particular that the space curve parametrized by 815&_mathId=si3.gif&_user=111111111&_pii=S0747717116300815&_rdoc=1&_issn=07477171&md5=82b172a5e918167a31cbd9b302dc0f44" title="Click to view the MathML source">f1,…,fs has a flat deformation into a monomial curve.