From 986b700ea6e05d3a1936d40be498543950a6c5ac Mon Sep 17 00:00:00 2001
From: David Allemang <allemang.d@gmail.com>
Date: Thu, 25 May 2017 16:23:10 -0400
Subject: [PATCH] implemented sub

---
 WpfTex/LatexEditor/MainWindow.xaml                 | 6 +++++-
 WpfTex/LatexEditor/Parser/Segments/LatexSegment.cs | 9 +++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/WpfTex/LatexEditor/MainWindow.xaml b/WpfTex/LatexEditor/MainWindow.xaml
index 16333e5..79cbe7d 100644
--- a/WpfTex/LatexEditor/MainWindow.xaml
+++ b/WpfTex/LatexEditor/MainWindow.xaml
@@ -10,7 +10,11 @@
         <local:LatexViewer FontSize="80">
 <!--            e^{\pi i}=-1\{\textrm{in the complex plane} \\\\-->
             
-            b^x+b^y=b^{x+y}
+            a^x+a^y=a^{x+y} \\
+            
+            log_ax^n=nlog_ax \\
+            
+            M^1_2
             
 <!--            A \  \alpha \quad N \  \nu \\-->
 <!--            B \  \beta \quad  \Xi \  \xi \\-->
diff --git a/WpfTex/LatexEditor/Parser/Segments/LatexSegment.cs b/WpfTex/LatexEditor/Parser/Segments/LatexSegment.cs
index 0233a31..7aeb774 100644
--- a/WpfTex/LatexEditor/Parser/Segments/LatexSegment.cs
+++ b/WpfTex/LatexEditor/Parser/Segments/LatexSegment.cs
@@ -76,6 +76,15 @@ namespace LatexEditor.Parser.Segments
                             val.Offset = new Point(val.Offset.X, val.Offset.Y + 0.45);
                         }
                     }
+                    if (head.Value == "_")
+                    {
+                        if (PopLatexSegment(tokens, out var content))
+                        {
+                            val = content;
+                            val.Size *= 0.7;
+                            val.Offset = new Point(val.Offset.X, val.Offset.Y - 0.45);
+                        }
+                    }
                     break;
 
                 case "escape":