|  |  5.1.5 char 
 
See
 charstr;
 ring.Syntax:char (ring_name)Type:int
Purpose:returns the characteristic of the coefficient field of a ring.
Example:|  |   ring r=32003,(x,y),dp;
  char(r);
==> 32003
  ring s=0,(x,y),dp;
  char(s);
==> 0
  ring ra=(7,a),(x,y),dp;
  minpoly=a^3+a+1;
  char(ra);
==> 7
  ring rp=(49,a),(x,y),dp;
  char(rp);
==> 7
  ring rr=real,x,dp;
  char(rr);
==> 0
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