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4.18.4 ring operations
+
- construct a new ring
from
and
.
(The sets of variables must be distinct).
== ,<>
- compare two rings
Note:
Concerning the ground fields
and
take the
following guide lines into consideration:
- Neither
nor
may be
or
.
- If the characteristic of
and
differs, then one of them must be
.
- At most one of
and
may have parameters.
- If one of
and
is an algebraic extension of
it may not be defined by a
charstr of type (p^n,a) .
Example:
| ring R1=0,(x,y),dp;
ring R2=32003,(a,b),dp;
def R=R1+R2;
R;
==> // characteristic : 32003
==> // number of vars : 4
==> // block 1 : ordering dp
==> // : names x y
==> // block 2 : ordering dp
==> // : names a b
==> // block 3 : ordering C
|
ring_lib
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