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D.2.6.6 defringp

Procedure from library ring.lib (see ring_lib).

Usage:
defringp(n,[p]); n,p=integers

Create:
defines a ring with name Pn, characteristic p, ordering dp and n variables x,y,z,a,b,...if n<=26 (resp. x(1..n) if n>26) and makes it the basering (default: p=32003)

Return:
No return value

Example:
 
LIB "ring.lib";
defringp(5,0); P5; "";
==> // basering is now: ring P5=0,(x,y,z,a,b),dp;
==> //   characteristic : 0
==> //   number of vars : 5
==> //        block   1 : ordering dp
==> //                  : names    x y z a b 
==> //        block   2 : ordering C
==> 
defringp(30); P30;
==> // basering is now: ring P30=32003,x(1..30),dp;
==> //   characteristic : 32003
==> //   number of vars : 30
==> //        block   1 : ordering dp
==> //                  : names    x(1) x(2) x(3) x(4) x(5) x(6) x(7) x(8) x(\
   9) x(10) x(11) x(12) x(13) x(14) x(15) x(16) x(17) x(18) x(19) x(20) x(21\
   ) x(22) x(23) x(24) x(25) x(26) x(27) x(28) x(29) x(30) 
==> //        block   2 : ordering C
kill P5, P30;
if(system("with","Namespaces")) {
if( nameof(Current) == "Ring" ) {
kill Top::P5,Top::P30;
} else {
kill Ring::P5,Ring::P30;
}
}


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