VS 10 includes, and I have a linker error

I am using Visual Studio 10 to program in C++

The 1st part of my program is //Includes

//#include <LEDA\numbers>               //fatal error C1083: Cannot open include file: 'LEDA\numbers': No such file or directory

#include <LEDA/numbers/real.h>      
//Why do I get a linker error here
//All.obj : error LNK2001: unresolved external symbol "class leda::memory_manager leda::std_memory_mgr" (?std_memory_mgr@leda@@3Vmemory_manager@1@A)
#include <LED开发者_StackOverflow中文版A\numbers\integer.h>       //Here I used the system to write most of it for me
#include <LEDA/numbers/integer.h>            //Include LEDA. So 2 things 
        //1. including the same file twice does not matter
        //2. forward slashes and backward slashes are the same
      //I tried to use a wild card and said   #include <LEDA/numbers/*>  
      //But that did not work

 #include <LEDA/numbers/rational.h>
 #include <LEDA/core/string.h>
 #include <LEDA/core/array.h>
 #include <LEDA/numbers/bigfloat.h>  

      //The sqrt does not work


 #include <iostream>                          //include ordinary C++
 #include <math.h>

and I have a LINKER error

I have tried specifying which libraries to use by specifying the LIB User Environment symbol

I have tried specifying which libraries to use by specifying the Include Directories and Library Directories

in the properties of my Project

I have made a mistake somewhere, BUT where is it

---

There are several mistakes in this program:

1. LEDA\numbers is apparently a directory, not an include file. So you shouldn't try to include it.
2. (conceptual) #include statements don't help in resolving linker errors at all. Instead, you need to specify the libraries you want to link with to the linker; libraries are files that end in .lib. Go to the project settings, and add the libraries containing the missing symbols.

---

#include <abcd.h> // looks for the include abcd.h in the INCLUDES path.

#include "abcd.h" // looks for the include abcd.h in the current path and then INCLUDES path.

From your description it looks like your LEDA lib in under your current directory. Try using "" instead of <> and see if it fixes your errors.