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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/not_span.html).*
+
+# Not (`¬`)
+
+## `¬ 𝕩`: Logical Not
+
+Logical Not of `𝕩`.
+
+[Pervasive.](https://mlochbaum.github.io/BQN/doc/arithmetic.html#pervasion)
+
+ ¬ 0
+
+ ¬ 1‿0
+
+
+
+## `𝕨 ¬ 𝕩`: Span
+
+Count of numbers in the inclusive range from `𝕩` to `𝕨`.
+
+[Pervasive.](https://mlochbaum.github.io/BQN/doc/arithmetic.html#pervasion)
+
+ 3 ¬ 1
+
+ 3‿4 ¬ 0‿2
+
+