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Macaulay2Doc :: Symbol _ Thing

Symbol _ Thing -- index variable

Synopsis

Description

The subscript can be anything, even a mutable object. Often, the subscripts are numbers or sequences. Sequences usually print nicer than lists.
i1 : x_(1,3)

o1 = x
      1,3

o1 : IndexedVariable
i2 : x_{1,3}

o2 = x
      {1, 3}

o2 : IndexedVariable
Indexed variables can be used for ring variables.
i3 : R = ZZ[x_(1,1)..x_(2,3),y_a..y_f]

o3 = R

o3 : PolynomialRing
i4 : gens R

o4 = {x   , x   , x   , x   , x   , x   , y , y , y , y , y , y }
       1,1   1,2   1,3   2,1   2,2   2,3   a   b   c   d   e   f

o4 : List