From 2a28e0b12f256ee7c109c0646d7daac5807f741c Mon Sep 17 00:00:00 2001 From: Gregor Kleen Date: Fri, 29 Jan 2016 21:42:06 +0100 Subject: fixed math --- provider/posts/simmons-intro-to-cat-t/1.1.md | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/provider/posts/simmons-intro-to-cat-t/1.1.md b/provider/posts/simmons-intro-to-cat-t/1.1.md index f95c068..d1ece85 100644 --- a/provider/posts/simmons-intro-to-cat-t/1.1.md +++ b/provider/posts/simmons-intro-to-cat-t/1.1.md @@ -10,7 +10,7 @@ Sets and functions do form a category $\ca{Set}$.
The objects of $\ca{Set}$ are sets and its arrows are functions. -For any set $A$ we construct \idarr{A} by restricting \id to $A$: +For any set $A$ we construct $\idarr{A}$ by restricting $\id$ to $A$: $$\idarr{A} = \id \upharpoonright A$$ $\circ$ is indeed associative. @@ -23,7 +23,7 @@ Each [poset](https://en.wikipedia.org/wiki/Partially_ordered_set) is a category.
The objects of each poset are its elements and we construct an arrow $\begin{tikzcd} a \arrow[r, "\leq"] & b \end{tikzcd}$ for every pair of objects $(a, b)$ iff $a \leq b$. -Reflexivity ($a \leq a$) and transitivity ($a \leq b \land b \leq c \implies a \leq c$) provide a construction for \idarr{a} and $\circ$, respectively. +Reflexivity ($a \leq a$) and transitivity ($a \leq b \land b \leq c \implies a \leq c$) provide a construction for $\idarr{a}$ and $\circ$, respectively.
@@ -33,6 +33,6 @@ Each [monoid](https://en.wikipedia.org/wiki/Monoid) is a category.
The objects of each monoid are its elements and we construct for every pair of elements $(a, b)$ an arrow $\begin{tikzcd} a \arrow[r, "\cdot b"] & a \cdot b \end{tikzcd}$. -The existence of an identity element and associativity, as required by the monoid structure, immediately provide us with a construction for \id and associativity of $\circ$. +The existence of an identity element and associativity, as required by the monoid structure, immediately provide us with a construction for $\id$ and associativity of $\circ$.
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