 ring S=0,(x,y,z,a(1)),dp;
2x, x3, 2x2y3, xyz, 2xy2; // are monomials
2*x, x^3, 2*x^2*y^3, x*y*z, 2*x*y^2; // are poly expressions
2*a(1); // is a valid polynomial expression (a(1) is a name of a variable),
// but not 2a(1) (is a syntax error)
2*x^3; // is a valid polynomial expression equal to 2x3 (a valid monomial)
// but not equal to 2x^3 which will be interpreted as (2x)^3
// since 2x is a monomial
ring r=0,(x,y),dp;
poly f = 10x2y3 +2x2y22xy+y x+2;
lead(f);
==> 10x2y3
leadmonom(f);
==> x2y3
simplify(f,1); // normalize leading coefficient
==> x2y3+1/5x2y21/5xy1/10x+1/10y+1/5
poly g = 1/2x2 + 1/3y;
cleardenom(g);
==> 3x2+2y
int i = 102;
poly(i);
==> 102
typeof(_);
==> poly
