mjo-common: add \tuple.

diff --git a/examples.tex b/examples.tex
index e70e0e1e0c63ad2d12ef667ebde7e69d9a6a0ad7..52326358fc9ca2f11637423b78f43125467a9e86 100644 (file)
--- a/examples.tex
+++ b/examples.tex
@@ -79,7 +79,8 @@
     The function $f$ applied to $x$ is $f\of{x}$, and the restriction
     of $f$ to a subset $X$ of its domain is $\restrict{f}{X}$. We can
     group terms like $a + \qty{b - c}$ or $a + \qty{b - \sqty{c -
-        d}}$. The tuples go up to seven, for now:
+        d}}$. The tuples go up to seven, for now, and then we give up
+    and use the general construct:
     %
     \begin{itemize}
       \begin{item}
@@ -100,6 +101,9 @@
       \begin{item}
         Septuple: $\septuple{1}{2}{3}{4}{5}{6}{7}$.
       \end{item}
+      \begin{item}
+        Tuple: $\tuple{1,2,\ldots,8675309}$.
+      \end{item}
     \end{itemize}
     %
     The factorial of the number $10$ is $\factorial{10}$, and the

diff --git a/mjo-common.tex b/mjo-common.tex
index 6b357abdbec9b5cdd53dd4c037d2d2e67375432b..ccb22daa8509db9788d8c357a741ea4b53c37495 100644 (file)
--- a/mjo-common.tex
+++ b/mjo-common.tex
@@ -39,6 +39,12 @@
 % A seven-tuple of things.
 \newcommand*{\septuple}[7]{ \left({#1},{#2},{#3},{#4},{#5},{#6},{#7}\right) }
 
+% A free-form tuple of things. Useful for when the exact number is not
+% known, such as when \ldots will be stuck in the middle of the list,
+% and when you don't want to think in column-vector terms, e.g. with
+% elements of an abstract Cartesian product space.
+\newcommand*{\tuple}[1]{ \left({#1}\right) }
+
 % The "least common multiple of" function. Takes a nonempty set of
 % things that can be multiplied and ordered as its argument. Name
 % chosen for synergy with \gcd, which *does* exist already.