Merge pull request #17 from singam1/main

Fix: Correct variable name in pos_or_neg lambda function

content/07a_opcodes/02_math.ipynb

@@ -123,7 +123,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "pos_or_neg = lambda number: -1 if value < 0 else 1"
+    "pos_or_neg = lambda number: -1 if number < 0 else 1"
    ]
   },
   {