An "indeterminate" is represented by a name consisting of either a
single lower case letter or a lower case letter followed by one or
more indices. For example, x, x[1], x[1,2,3] are legal (and different)
indeterminates, as is x[2I,2I+1] if I is an integer variable.
When creating a ring, the indeterminates are listed, optionally
separated by commas. Indeterminates with indices are formed with the
syntax: x[R_1,...,R_n], where x is any lower case letter and each R_i
has the form a_i..b_i for integers a_i <= b_i.
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Use R ::= Q[x[1..2,4..8],y[1..3],u,v];
Indets();
[x[1,4], x[1,5], x[1,6], x[1,7], x[1,8], x[2,4], x[2,5], x[2,6],
x[2,7], x[2,8], y[1], y[2], y[3], u, v]
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