diff --git a/journal/2021-08-10.md b/journal/2021-08-10.md
index bb240d2e1..f943ef035 100644
--- a/journal/2021-08-10.md
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@@ -10,3 +10,4 @@
 - [[peak honesty capitalism]]
 - [[rael zero]]
 - [[bairn ashtrit]]
+- [[power set]]
diff --git a/power set.md b/power set.md
new file mode 100644
index 000000000..e62152e61
--- /dev/null
+++ b/power set.md	
@@ -0,0 +1,6 @@
+# power set
+
+- a [[function]]
+  - [[go]] https://en.wikipedia.org/wiki/Power_set
+  - [[cardinality]] `2^n` as you can choose to have or not to have each individual item in the original set.
+