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update doc

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2022-12-12 18:56:21 -08:00
parent e648e68d36
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29
src/tactic/arith/fix_dl_var_tactic.h
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@ -7,18 +7,35 @@ Module Name:
Abstract:
Fix a difference logic variable to 0.
If the problem is in the difference logic fragment, that is, all arithmetic terms
are of the form (x + k), and the arithmetic atoms are of the
form x - y <= k or x - y = k. Then, we can set one variable to 0.
This is useful because, many bounds can be exposed after this operation is performed.
Author:
Leonardo (leonardo) 2011-12-29
Notes:
Tactic Documentation:
## Tactic fix-dl-var
### Short Description
Fix a difference logic variable to `0`.
If the problem is in the difference logic fragment, that is, all arithmetic terms
are of the form `(x + k)`, and the arithmetic atoms are of the
form `x - y <= k` or `x - y = k`. Then, we can set one variable to `0`.
This is useful because, many bounds can be exposed after this operation is performed.
### Example
```z3
(declare-const x Real)
(declare-const y Real)
(declare-const z Real)
(assert (<= (+ x (* -1.0 y)) 3.0))
(assert (<= (+ x (* -1.0 z)) 5.0))
(apply fix-dl-var)
```
--*/
#pragma once