Difference between revisions of "ApCoCoA-1:NCo.BTruncatedGB"
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<em>Please note:</em> The function(s) explained on this page is/are using the <em>ApCoCoAServer</em>. You will have to start the ApCoCoAServer in order to use it/them. | <em>Please note:</em> The function(s) explained on this page is/are using the <em>ApCoCoAServer</em>. You will have to start the ApCoCoAServer in order to use it/them. | ||
<par/> | <par/> | ||
| − | Please set ring environment <em>alphabet</em> (or set of indeterminates) <tt>X</tt> and <em>word ordering</em> via the functions <ref>NCo.SetX</ref> and <ref>NCo.SetOrdering</ref>, respectively, before calling this function. The default ordering is the length-lexicographic ordering (<quotes>LLEX</quotes>). For more information, please check the relevant functions. | + | Please set ring environment <em>alphabet</em> (or set of indeterminates) <tt>X</tt> and <em>word ordering</em> via the functions <ref>ApCoCoA-1:NCo.SetX|NCo.SetX</ref> and <ref>ApCoCoA-1:NCo.SetOrdering|NCo.SetOrdering</ref>, respectively, before calling this function. The default ordering is the length-lexicographic ordering (<quotes>LLEX</quotes>). For more information, please check the relevant functions. |
<itemize> | <itemize> | ||
<item>@param <em>G</em>: a LIST of non-zero homogeneous polynomials generating a two-sided ideal in the free monoid ring <tt>F_{2}<X></tt>. Each word is represented as a STRING. For example, <tt>xy^2x</tt> is represented as <quotes>xyyx</quotes>, and the identity is represented as the empty string <quotes></quotes>. Thus, the polynomial <tt>f=xy-y+1</tt> is represented as F:=[<quotes>xy</quotes>, <quotes>y</quotes>, <quotes></quotes>]. The zero polynomial <tt>0</tt> is represented as the empty LIST [].</item> | <item>@param <em>G</em>: a LIST of non-zero homogeneous polynomials generating a two-sided ideal in the free monoid ring <tt>F_{2}<X></tt>. Each word is represented as a STRING. For example, <tt>xy^2x</tt> is represented as <quotes>xyyx</quotes>, and the identity is represented as the empty string <quotes></quotes>. Thus, the polynomial <tt>f=xy-y+1</tt> is represented as F:=[<quotes>xy</quotes>, <quotes>y</quotes>, <quotes></quotes>]. The zero polynomial <tt>0</tt> is represented as the empty LIST [].</item> | ||
| Line 44: | Line 44: | ||
</description> | </description> | ||
<seealso> | <seealso> | ||
| − | <see>NCo.BGB</see> | + | <see>ApCoCoA-1:NCo.BGB|NCo.BGB</see> |
| − | <see>NCo.BIsGB</see> | + | <see>ApCoCoA-1:NCo.BIsGB|NCo.BIsGB</see> |
| − | <see>NCo.BLW</see> | + | <see>ApCoCoA-1:NCo.BLW|NCo.BLW</see> |
| − | <see>NCo.BReducedGB</see> | + | <see>ApCoCoA-1:NCo.BReducedGB|NCo.BReducedGB</see> |
| − | <see>NCo.SetOrdering</see> | + | <see>ApCoCoA-1:NCo.SetOrdering|NCo.SetOrdering</see> |
| − | <see>NCo.SetX</see> | + | <see>ApCoCoA-1:NCo.SetX|NCo.SetX</see> |
| − | <see>Introduction to CoCoAServer</see> | + | <see>ApCoCoA-1:Introduction to CoCoAServer|Introduction to CoCoAServer</see> |
</seealso> | </seealso> | ||
<types> | <types> | ||
Revision as of 08:28, 7 October 2020
NCo.BTruncatedGB
Compute a truncated Groebner basis of a finitely generated homogeneous two-sided ideal in a free monoid ring over the binary field F_{2}={0,1}.
Syntax
NCo.BTruncatedGB(G:LIST, DB:INT):LIST
Description
Given a word ordering and a homogeneous two-sided ideal I, a set of non-zero polynomials G is called a Groebner basis of I if the leading word set BLW{G} generates the leading word ideal BLW(I). Note that it may not exist finite Groebner basis of the ideal I. Moreover, let D be a positive integer. Then the set {g in G | Deg(g)<=D} is a Groebner basis of the ideal <f in I | Deg(f)<=D> and is called a D-truncated Groebner basis of I.
Please note: The function(s) explained on this page is/are using the ApCoCoAServer. You will have to start the ApCoCoAServer in order to use it/them.
Please set ring environment alphabet (or set of indeterminates) X and word ordering via the functions NCo.SetX and NCo.SetOrdering, respectively, before calling this function. The default ordering is the length-lexicographic ordering ("LLEX"). For more information, please check the relevant functions.
@param G: a LIST of non-zero homogeneous polynomials generating a two-sided ideal in the free monoid ring F_{2}<X>. Each word is represented as a STRING. For example, xy^2x is represented as "xyyx", and the identity is represented as the empty string "". Thus, the polynomial f=xy-y+1 is represented as F:=["xy", "y", ""]. The zero polynomial 0 is represented as the empty LIST [].
@param DB: a positive INT, which gives a degree bound of S-polynomials (or obstructions) during the Buchberger enumerating procedure. The procedure will discard S-polynomials (or obstructions) whose degrees are larger than DB.
@return: a LIST of polynomials, which is a truncated Groebner basis at degree DB with respect to the current word ordering if the enumerating procedure doesn't terminate due to reaching the loop bound LB, and is a partial Groebner basis otherwise.
Example
NCo.SetX(<quotes>xyz</quotes>); F1:=[<quotes>yxy</quotes>,<quotes>zyz</quotes>]; F2:=[<quotes>xyx</quotes>,<quotes>zxy</quotes>]; F3:=[<quotes>zxz</quotes>,<quotes>yzx</quotes>]; F4:=[<quotes>xxx</quotes>,<quotes>yyy</quotes>,<quotes>zzz</quotes>,<quotes>xyz</quotes>]; G:=[F1,F2,F3,F4]; NCo.BTruncatedGB(G,6); [[<quotes>yzx</quotes>, <quotes>zxz</quotes>], [<quotes>yxy</quotes>, <quotes>zyz</quotes>], [<quotes>xyx</quotes>, <quotes>zxy</quotes>], [<quotes>xxx</quotes>, <quotes>xyz</quotes>, <quotes>yyy</quotes>, <quotes>zzz</quotes>], [<quotes>zxzy</quotes>, <quotes>zzxz</quotes>], [<quotes>xzyz</quotes>, <quotes>zxyy</quotes>], [<quotes>xxyz</quotes>, <quotes>xyyy</quotes>, <quotes>xzxz</quotes>, <quotes>xzzz</quotes>, <quotes>yyyx</quotes>, <quotes>zzzx</quotes>], [<quotes>zzxyy</quotes>, <quotes>zzxzz</quotes>], [<quotes>yzzxz</quotes>, <quotes>zxzzy</quotes>], [<quotes>yzzxy</quotes>, <quotes>zzxzx</quotes>], [<quotes>yzyyy</quotes>, <quotes>yzzzz</quotes>, <quotes>zxzxx</quotes>, <quotes>zzxzz</quotes>], [<quotes>yxzxz</quotes>, <quotes>zyzzx</quotes>], [<quotes>xzzxz</quotes>, <quotes>zxyyx</quotes>], [<quotes>xyyyy</quotes>, <quotes>xyzzz</quotes>, <quotes>zxyyz</quotes>, <quotes>zzzxy</quotes>], [<quotes>xxzxz</quotes>, <quotes>xyyyx</quotes>, <quotes>xzxzx</quotes>, <quotes>xzzzx</quotes>, <quotes>yyyxx</quotes>, <quotes>zzzxx</quotes>], [<quotes>xxzxy</quotes>, <quotes>xyzyx</quotes>, <quotes>yyyyx</quotes>, <quotes>zzzyx</quotes>], [<quotes>xxyyy</quotes>, <quotes>xxzzz</quotes>, <quotes>xyzyz</quotes>, <quotes>xzxzx</quotes>, <quotes>yyyxx</quotes>, <quotes>yyyyz</quotes>, <quotes>zzzxx</quotes>, <quotes>zzzyz</quotes>], [<quotes>zxzzyz</quotes>, <quotes>zzxzxy</quotes>], [<quotes>yzzzxz</quotes>, <quotes>zxzzyy</quotes>], [<quotes>yzzzxy</quotes>, <quotes>zzxzxx</quotes>], [<quotes>xzzzxz</quotes>, <quotes>zxyzyz</quotes>], [<quotes>xyyzyz</quotes>, <quotes>xzxyyx</quotes>, <quotes>xzxzxy</quotes>, <quotes>xzzzxy</quotes>, <quotes>yyyxxy</quotes>, <quotes>zzzxxy</quotes>], [<quotes>xxzzzy</quotes>, <quotes>xyyyzz</quotes>, <quotes>xyzyzy</quotes>, <quotes>xzxyyz</quotes>, <quotes>xzxzxy</quotes>, <quotes>xzxzzz</quotes>, <quotes>xzzzxy</quotes>, <quotes>xzzzzz</quotes>, <quotes>yyyxxy</quotes>, <quotes>yyyxzz</quotes>, <quotes>yyyyzy</quotes>, <quotes>zzzxxy</quotes>, <quotes>zzzxzz</quotes>, <quotes>zzzyzy</quotes>], [<quotes>xxzzxy</quotes>, <quotes>xyzyxx</quotes>, <quotes>yyyyxx</quotes>, <quotes>zzzyxx</quotes>]] -------------------------------
See also
