diff --git a/omnn/math/CMakeLists.txt b/omnn/math/CMakeLists.txt
index e87d70db08..5776c5f2fb 100644
--- a/omnn/math/CMakeLists.txt
+++ b/omnn/math/CMakeLists.txt
@@ -1,3 +1,5 @@
+project(math)
+cmake_minimum_required(VERSION 3.20)
 
 option(OPENMIND_MATH_USE_LEVELDB_CACHE "Use Google LevelDB library to cache solutions" TRUE)
 if(OPENMIND_MATH_USE_LEVELDB_CACHE)
@@ -28,18 +30,18 @@ if(NOT WIN32)
 	set(DEPENDENCIES ${DEPENDENCIES} boost_thread boost_serialization boost_system)
 endif()
 
-lib(${DEPENDENCIES})
+link_libraries(${DEPENDENCIES})
 
-if (OPENMIND_USE_OPENCL)
-	target_include_directories(${this_target} PUBLIC
-		${OpenCL_INCLUDE_DIR}
-		)
-endif()
+if (OPENMIND_USE_OPENCL)
+	target_include_directories(${this_target} PUBLIC
+		${OpenCL_INCLUDE_DIR}
+		)
+endif()
 
-if (OPENMIND_BUILD_TESTS)
+if (OPENMIND_BUILD_TESTS)
     add_subdirectory(test)
 endif ()
 
-if (OPENMIND_BUILD_3RD_PARTY_TESTS)
+if (OPENMIND_BUILD_3RD_PARTY_TESTS)
     add_subdirectory(3rdPartyTests)
 endif ()
diff --git a/omnn/math/CacheFDBtry3.h b/omnn/math/CacheFDBtry3.h
new file mode 100644
index 0000000000..c3479dedff
--- /dev/null
+++ b/omnn/math/CacheFDBtry3.h
@@ -0,0 +1,146 @@
+#pragma once
+
+
+
+#ifdef OPENMIND_MATH_USE_FOUNDATIONDB_CACHE
+
+#include <foundationdb/fdb_c.h>
+
+#include <free_fdb/ffdb.h>
+
+#else
+
+namespace fdb_cli{
+	class FDB;
+}
+#endif
+
+
+//#include <filesystem>
+//#include <future>
+#include <memory>
+#include <string>
+
+#include <boost/filesystem.hpp>
+#include "Variable.h"
+
+namespace omnn::math {
+
+namespace bi = boost::intrusive;
+    
+class EvictablePage
+    {
+    public:
+      using  path_str_t = bi::path
+    	using CheckCacheResult = std::pair<bool,Valuable>;
+
+    template < typename pageCache>
+		
+  	class Reference : public EvictablePageCache ::future<pageCache> {
+			using base = std::future<pageCache>;//creo que lo de abajo es lo mismo
+			virtual bool evict() = 0; //  evic=extracted
+
+
+			//EvictablePage(Reference<EvictablePageCache> pageCache) :  pageCache(pageCache) {} 
+       // virtual ~EvictablePage();
+    }
+       
+
+   		 protected: 
+          pageCache& Get() {
+          evict()//Extract();
+          return pageCache;
+            }
+       
+
+			 public:
+            using bi::bi;
+
+          Reference (bi&& b) : bi(std::move(b))
+          {}
+
+          operator bool(){
+            return (evict ||
+              ( bi::valid()
+                && bi::wait_for(std::chrono::seconds(0)) == std::future_status::ready
+                )) && Get().first
+                ;
+          }
+
+          bool NotInCache(){
+            return (evict ||
+                ( bi::valid()
+                  && bi::wait_for(std::chrono::seconds(0)) == std::future_status::ready
+                  )) && !Get().first;
+          }
+        };
+
+class EvictablePageCache :  public ReferenceCounted<EvictablePageCache>
+ {
+     using List =
+         bi::list<EvictablePage, bi::path<EvictablePage, bi::future<>, &EvictablePage::path>>;
+ 
+          public:
+            using bi::bi;
+            using bi::operator bool;
+//            EvictablePageCache (bi&& b);
+            operator Valuable();
+        };
+
+        using val_set_t = Valuable::solutions_t;
+        using CheckCachedSet = std::pair<bool,val_set_t>;
+
+
+
+
+
+
+  class CachedSet : public ReferenceCounted <CheckCachedSet> {
+        using base = ReferenceCounted <CheckCachedSet>;
+      public:
+            using bi::bi;
+            using bi::operator bool;
+//            CachedSet(bi&& b);
+            operator val_set_t();
+        };
+
+    private:
+        fdb_cli::FDB* fdb_c = nullptr;
+        path_str_t path;
+
+
+
+             // Opens a file that uses the FDB in-memory page cache
+     static Future<Reference<IAsyncFile>> open(std::string filename, int flags, int mode) {
+         //TraceEvent("AsyncFileCachedOpen").detail("Filename", filename);
+         auto itr = openFiles.find(filename);
+         if (itr == openFiles.end()) {
+             auto f = open_impl(filename, flags, mode);
+             if (f.isReady() && f.isError())
+                 return f;
+ 
+             auto result = openFiles.try_emplace(filename, f);
+ 
+             // This should be inserting a new entry
+             ASSERT(result.second);
+             itr = result.first;
+ 
+             // We return here instead of falling through to the outer scope so that we don't delete all references to
+             // the underlying file before returning
+             return itr->second.get();
+         }
+         return itr->second.get();
+     }
+
+
+        void DbOpen();
+    protected:
+        std::string Value(const std::string& key);
+        
+    public:
+        Cachefdb(const path_str_t& path);
+        ~Cachefdb();
+
+		public:
+			Cachefdb(const path_str_t&amp; path);
+			~Cachefdb();
diff --git a/omnn/math/CachefdbTRY2.h b/omnn/math/CachefdbTRY2.h
new file mode 100644
index 0000000000..8fed4d1a43
--- /dev/null
+++ b/omnn/math/CachefdbTRY2.h
@@ -0,0 +1,110 @@
+#pragma once
+//pragma says include the file once
+
+
+#ifdef OPENMIND_MATH_USE_FOUNDATIONDB_CACHE
+//check the following function is defined
+
+
+#include <foundationdb/fdb_c.h>
+
+#include <free_fdb/ffdb.hh>
+//copy and paste files into other files
+
+#else
+
+namespace fdb_cli{
+class FDB;
+}
+#endif
+
+
+
+//#include <filesystem>
+#include <future>
+#include <memory>
+#include <string>
+
+#include <boost/filesystem.hpp>
+//definition and implementation are in the same file, .hpp calls a class
+
+#include "Variable.h"
+
+namespace omnn::math {
+
+namespace fs = boost::filesystem;
+
+    class Cachefdb
+    {
+    public:
+        using path_str_t_fdb = fs::path;
+
+        using CheckCache_fdb_Result = std::pair<bool,Valuable>;
+
+        template <typename ResultT_fdb>
+
+        class Cached_fdb_ValueBase : public std::future<ResultT_fdb> {
+          using base_fdb = std::future<ResultT_fdb>;
+            ResultT_fdb result_fdb = {};
+            bool extracted_fdb = {};
+            void Extract_fdb() {
+                if(!extracted_fdb){
+                    extracted_fdb = true;
+                    result_fdb = base::get(); //class base method get
+                }
+            }
+        protected: //once it's gotten the value becomes protected i.e. only member of class' functions can access to it
+                   //but it cannot be accesed from other classes
+            ResultT_fdb& Get() {
+                Extract_fdb();
+                return result_fdb;
+            }
+        public:
+          using base::base;
+
+            Cached_fdb_ValueBase(base&& b) : base(std::move(b))
+          {}
+
+          operator bool(){
+            return (extracted_fdb ||
+              ( base::valid_fdb()
+                && base::wait_for(std::chrono::seconds(0)) == std::future_status::ready
+                )) && Get().first
+                ;
+          }
+
+          bool NotInCache_fdb(){
+            return (extracted_fdb ||
+                ( base::valid_fdb()
+                  && base::wait_for(std::chrono::seconds(0)) == std::future_status::ready
+                  )) && !Get().first;
+          }
+        };
+
+        class Cached_fdb : public Cached_fdb_ValueBase<CheckCache_fdb_Result> {
+            using base = Cached_fdb_ValueBase<CheckCache_fdb_Result>;
+        public:
+            using base::base;
+            using base::operator bool;
+//            Cached_fdb(base&& b);
+            operator Valuable_fdb();
+        };
+
+        using val_set_t_fdb = Valuable::solutions_t;
+        using CheckCached_fdb_Set = std::pair<bool,val_set_t>;
+
+        class Cached_fdb_Set : public Cached_fdb_ValueBase<CheckCached_fdb_Set> {
+            using base = Cached_fdb_ValueBase<CheckCached_fdb_Set>;
+        public:
+            using base::base;
+            using base::operator bool;
+//            CachedSet_fdb(base&& b);
+            operator val_set_t();
+        };
+        
+        
+        
+        
+        
+
+   
\ No newline at end of file