|  |  5.1.114 par 
See
 char;
 npars;
 parstr;
 ring;
 var.Syntax:par (int_expression)Type:number
Purpose:par(n);returns the n-th parameter of the basering.Example:|  |   ring r=(0,a,b,c),(x,y,z),dp;
  char(r);  // char to get the characteristic
==> 0
  par(2);   // par to get the n-th parameter
==> (b)
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