Add the \preimage macro.

[mjotex.git] / examples.tex

diff --git a/examples.tex b/examples.tex
index a491bd813ae521de8254498c3afe57f4cfca3dbf..e0ffcb97a11ce5a97a2e837e7c994fd19714e1ae 100644 (file)
--- a/examples.tex
+++ b/examples.tex
@@ -28,7 +28,8 @@
   \begin{section}{Arrow}
     The identity operator on $V$ is $\identity{V}$. The composition of
     $f$ and $g$ is $\compose{f}{g}$. The inverse of $f$ is
-    $\inverse{f}$.
+    $\inverse{f}$. If $f$ is a function and $A$ is a subset of its
+    domain, then the preimage under $f$ of $A$ is $\preimage{f}{A}$.
   \end{section}
 
   \begin{section}{Common}
@@ -103,6 +104,30 @@
     The set of all bounded linear operators from $V$ to $W$ is
     $\boundedops[W]{V}$. If $W = V$, then we write $\boundedops{V}$
     instead.
+
+    The direct sum of $V$ and $W$ is $\directsum{V}{W}$, of course,
+    but what if $W = V^{\perp}$? Then we wish to indicate that fact by
+    writing $\directsumperp{V}{W}$. That operator should survive a
+    display equation, too, and the weight of the circle should match
+    that of the usual direct sum operator.
+    %
+    \begin{align*}
+      Z = \directsumperp{V}{W}\\
+      \oplus \oplusperp \oplus \oplusperp
+    \end{align*}
+    %
+    Its form should also survive in different font sizes...
+    \Large
+    \begin{align*}
+      Z = \directsumperp{V}{W}\\
+      \oplus \oplusperp \oplus \oplusperp
+    \end{align*}
+    \Huge
+    \begin{align*}
+      Z = \directsumperp{V}{W}\\
+      \oplus \oplusperp \oplus \oplusperp
+    \end{align*}
+    \normalsize
   \end{section}
 
   \begin{section}{Listing}