diff --git a/include/blt/math/math.h b/include/blt/math/math.h
index df6ae91..58abd31 100644
--- a/include/blt/math/math.h
+++ b/include/blt/math/math.h
@@ -11,7 +11,13 @@
 #include <blt/math/matrix.h>
 
 namespace blt {
-
+    
+    constexpr float EPSILON = 0.0001f;
+    
+    static inline constexpr bool f_equal(float v1, float v2) {
+        return v1 >= v2 - EPSILON && v1 <= v2 + EPSILON;
+    }
+    
     /**
      * fast number integer
      */