In general, AMPL interprets `a..b`

as `{a, a+1, a+2, ..., b-1, b}`

. Thus when `T`

is greater than one, `T..1`

is an empty set. To specify the ordered set that goes from `T`

down to `1`

, write `T..1 by -1`

.

`a..b`

as `{a, a+1, a+2, ..., b-1, b}`

. Thus when `T`

is greater than one, `T..1`

is an empty set. To specify the ordered set that goes from `T`

down to `1`

, write `T..1 by -1`

.