Upper - Maple Help

RegularChains[ChainTools]

 Upper
 list of polynomials of rc with main variable strictly greater than v

 Calling Sequence Upper(v, rc, R)

Parameters

 v - variable of of R rc - regular chain of R R - polynomial ring

Description

 • The command Upper(v, rc, R) returns the list of the polynomials of rc with main variable strictly greater than v.
 • This command is part of the RegularChains[ChainTools] package, so it can be used in the form Upper(..) only after executing the command with(RegularChains[ChainTools]).  However, it can always be accessed through the long form of the command by using RegularChains[ChainTools][Upper](..).

Examples

 > $\mathrm{with}\left(\mathrm{RegularChains}\right):$
 > $R≔\mathrm{PolynomialRing}\left(\left[x,y,z\right]\right)$
 ${R}{≔}{\mathrm{polynomial_ring}}$ (1)
 > $\mathrm{with}\left(\mathrm{ChainTools}\right):$
 > $T≔\mathrm{Empty}\left(R\right):$
 > $T≔\mathrm{Chain}\left(\left[\left(z+1\right)\left(z+2\right),{y}^{2}+z,\left(x-z\right)\left(x-y\right)\right],T,R\right)$
 ${T}{≔}{\mathrm{regular_chain}}$ (2)
 > $\mathrm{Equations}\left(T,R\right)$
 $\left[{{x}}^{{2}}{+}\left({-}{y}{-}{z}\right){}{x}{+}{z}{}{y}{,}{{y}}^{{2}}{+}{z}{,}{{z}}^{{2}}{+}{3}{}{z}{+}{2}\right]$ (3)
 > $\mathrm{polys}≔\mathrm{Upper}\left(z,T,R\right)$
 ${\mathrm{polys}}{≔}\left[{{y}}^{{2}}{+}{z}{,}{{x}}^{{2}}{-}{x}{}{y}{-}{z}{}{x}{+}{z}{}{y}\right]$ (4)