diff --git a/science/math/Math.md b/science/math/Math.md
index 64a3565..f47f2a7 100644
--- a/science/math/Math.md
+++ b/science/math/Math.md
@@ -1,5 +1,14 @@
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 obj: meta
+rev: 2024-05-02
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+
 # Math
-#🐇 #notnow 
\ No newline at end of file
+#🐇 #notnow 
+
+- [Graph Theory](Graph%20Theory.md)
+
+## Number Systems
+- [Binary System](Binary%20System.md)
+- [Decimal System](Decimal%20System.md)
+- [Hexadecimal System](Hexadecimal%20System.md)