add placeholder for simplification

src/math/polysat/simplify.cpp

@@ -0,0 +1,54 @@
+/*++
+Copyright (c) 2021 Microsoft Corporation
+
+Module Name:
+
+    Simplification
+
+Author:
+
+    Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-12
+
+Notes:
+
+This is a place holder for simplification.
+
+- Replace literals of the form p < 1 (which is ~(p >= 1)) by p <= 0
+
+- Rewrite clauses using factoring and normalization rules
+
+  - p*q <= 0 or C
+    -> p <= 0 or C, q <= 0 or C
+
+  - ovfl(1, x) or C 
+    -> C
+
+- Drop redundant literals from lemmas.
+
+- Generalize lemmas by replacing equalities or destructive resolution.
+
+  - x = k => C[x]
+    - C[k]
+
+  - x = k & y = k' => ax + by <= c
+    - lo <= x <= k & lo' <= y <= k' => ax + by <= c
+
+  
+--*/
+#pragma once
+#include "math/polysat/solver.h"
+#include "math/polysat/simplify.h"
+
+namespace polysat {
+
+    simplify::simplify(solver& s):
+        s(s)
+    {}
+
+    bool simplify::should_apply() const { 
+        return false; 
+    }
+
+    void simplify::operator()() {}
+
+}