@@ -8,7 +8,7 @@ In this lesson you're going to learn about Hoon functions.
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99## What is a Function?
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11−The word 'function' is used in various ways, but let's start by talking about them in the [mathematical sense](https://en.wikipedia.org/wiki/Function_%28mathematics%29). Roughly put, a function takes one or more arguments (i.e., input values) and returns a value. What the return value is depends solely on the argument(s), and nothing else. For example, we can understand multiplication as a function: it takes two numbers and returns another number. It doesn't matter where you ask, when you ask, or what kind of hat you're wearing when you ask. If you pass the same two numbers (e.g., `3` and `4`), you get the same answer returned every time (`12`).
11+The word 'function' is used in various ways, but let's start by talking about them in the [mathematical sense](https://en.wikipedia.org/wiki/Function_%28mathematics%29). Roughly put, a function takes one or more arguments (i.e., input values) and returns a value. The return value depends solely on the argument(s), and nothing else. For example, we can understand multiplication as a function: it takes two numbers and returns another number. It doesn't matter where you ask, when you ask, or what kind of hat you're wearing when you ask. If you pass the same two numbers (e.g., `3` and `4`), you get the same answer returned every time (`12`).
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1313That output value depends solely upon input value(s) is an important property of functions. This property is called [referential transparency](https://en.wikipedia.org/wiki/Referential_transparency), and we make use of it throughout the Urbit software stack.
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