|  |  4.3.2 bigintmat expressions 
A bigintmat expression is:
 
an identifier of type bigintmat
a function returning bigintmat
a bigintmat operation involving (big-)ints and int operations (+,-,*)
an expression involving bigintmats and the operations (+,-,*)
a type cast to bigintmat (see  bigintmat type cast)
 
Example:
 See
 Type conversion and casting;
 bigintmat.|  |   bigintmat m1[2][2]=1, 2, 6, 3;
  m1*3;
==>  3,6,
==> 18,9
  intmat im[3][2] = intmat(m1*3);
  bigintmat m2 = bigintmat(im); // cast intmat im to bigintmat
  m2;
==>  3,6,
==> 18,9
  m2*m1+m2;
==> 42,30,
==> 90,72
  _+4;
==> 46, 0,
==>  0,76
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