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D.2.9.1 setglobalrings
Procedure from library redcgs.lib (see redcgs_lib).
- Usage:
- setglobalrings();
No arguments
- Return:
- After its call the rings @R=K[a][x], @P=K[a], @RP=K[x,a] are
defined as global variables.
- Note:
- It is called by the fundamental routines of the library.
The user does not need to call it, except when none of
the fundamental routines have been called and some
other routines of the library are used.
The basering R, must be of the form K[a][x], a=parameters,
x=variables, and should be defined previously.
Example:
| | LIB "redcgs.lib";
ring R=(0,a,b),(x,y,z),dp;
setglobalrings();
@R;
==> // coefficients: QQ(a, b) considered as a field
==> // number of vars : 3
==> // block 1 : ordering dp
==> // : names x y z
==> // block 2 : ordering C
@P;
==> // coefficients: QQ considered as a field
==> // number of vars : 2
==> // block 1 : ordering lp
==> // : names a b
==> // block 2 : ordering C
@RP;
==> // coefficients: QQ considered as a field
==> // number of vars : 5
==> // block 1 : ordering dp
==> // : names x y z
==> // block 2 : ordering lp
==> // : names a b
==> // block 3 : ordering C
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