using a consistent naming convention for naming tactic subfolders

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/tactic/arith/degree_shift_tactic.h

@@ -0,0 +1,31 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    degree_shift_tactic.h
+
+Abstract:
+
+    Simple degree shift procedure. 
+    Basic idea: if goal G contains a real variable x, x occurs with degrees
+    d_1, ..., d_k in G, and n = gcd(d_1, ..., d_k) > 1. 
+    Then, replace x^n with a new fresh variable y.
+
+Author:
+
+    Leonardo de Moura (leonardo) 2011-12-30.
+
+Revision History:
+
+--*/
+#ifndef _DEGREE_SHIFT_TACTIC_H_
+#define _DEGREE_SHIFT_TACTIC_H_
+
+#include"params.h"
+class ast_manager;
+class tactic;
+
+tactic * mk_degree_shift_tactic(ast_manager & m, params_ref const & p = params_ref());
+
+#endif