outline for monomial bound propagation

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/math/lp/monomial_bounds.h

@@ -0,0 +1,27 @@
+/*++
+  Copyright (c) 2020 Microsoft Corporation
+
+  Author:
+  Nikolaj Bjorner (nbjorner)
+  Lev Nachmanson (levnach)
+
+  --*/
+#pragma once
+
+#include "math/lp/nla_common.h"
+#include "math/lp/nla_intervals.h"
+#include "math/lp/nex.h"
+#include "math/lp/cross_nested.h"
+#include "math/lp/u_set.h"
+
+namespace nla {
+    class core;
+
+    class monomial_bounds : common {
+        void var2interval(lpvar v, scoped_dep_interval& i);
+        bool propagate_up(monic const& m);
+    public:
+        monomial_bounds(core* core);
+        bool operator()();
+    }; 
+}