diff --git a/.gitignore b/.gitignore
index 76b26b7..87274a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+## MacOS
+.DS_Store
+
 ## Core latex/pdflatex auxiliary files:
 *.aux
 *.lof
diff --git a/background.tex.aux b/background.tex.aux
deleted file mode 100644
index 94b3cf2..0000000
--- a/background.tex.aux
+++ /dev/null
@@ -1,19 +0,0 @@
-\relax 
-\@setckpt{background.tex}{
-\setcounter{page}{3}
-\setcounter{equation}{0}
-\setcounter{enumi}{0}
-\setcounter{enumii}{0}
-\setcounter{enumiii}{0}
-\setcounter{enumiv}{0}
-\setcounter{footnote}{0}
-\setcounter{mpfootnote}{0}
-\setcounter{part}{0}
-\setcounter{section}{1}
-\setcounter{subsection}{0}
-\setcounter{subsubsection}{0}
-\setcounter{paragraph}{0}
-\setcounter{subparagraph}{0}
-\setcounter{figure}{0}
-\setcounter{table}{0}
-}
diff --git a/conclusion.tex.aux b/conclusion.tex.aux
deleted file mode 100644
index c33056d..0000000
--- a/conclusion.tex.aux
+++ /dev/null
@@ -1,19 +0,0 @@
-\relax 
-\@setckpt{conclusion.tex}{
-\setcounter{page}{3}
-\setcounter{equation}{0}
-\setcounter{enumi}{0}
-\setcounter{enumii}{0}
-\setcounter{enumiii}{0}
-\setcounter{enumiv}{0}
-\setcounter{footnote}{0}
-\setcounter{mpfootnote}{0}
-\setcounter{part}{0}
-\setcounter{section}{1}
-\setcounter{subsection}{0}
-\setcounter{subsubsection}{0}
-\setcounter{paragraph}{0}
-\setcounter{subparagraph}{0}
-\setcounter{figure}{0}
-\setcounter{table}{0}
-}
diff --git a/examples.tex.aux b/examples.tex.aux
deleted file mode 100644
index 76a9eb0..0000000
--- a/examples.tex.aux
+++ /dev/null
@@ -1,19 +0,0 @@
-\relax 
-\@setckpt{examples.tex}{
-\setcounter{page}{3}
-\setcounter{equation}{0}
-\setcounter{enumi}{0}
-\setcounter{enumii}{0}
-\setcounter{enumiii}{0}
-\setcounter{enumiv}{0}
-\setcounter{footnote}{0}
-\setcounter{mpfootnote}{0}
-\setcounter{part}{0}
-\setcounter{section}{1}
-\setcounter{subsection}{0}
-\setcounter{subsubsection}{0}
-\setcounter{paragraph}{0}
-\setcounter{subparagraph}{0}
-\setcounter{figure}{0}
-\setcounter{table}{0}
-}
diff --git a/filter.log b/filter.log
deleted file mode 100644
index e69de29..0000000
diff --git a/filter.tex.aux b/filter.tex.aux
deleted file mode 100644
index 4de93d8..0000000
--- a/filter.tex.aux
+++ /dev/null
@@ -1,19 +0,0 @@
-\relax 
-\@setckpt{filter.tex}{
-\setcounter{page}{3}
-\setcounter{equation}{0}
-\setcounter{enumi}{0}
-\setcounter{enumii}{0}
-\setcounter{enumiii}{0}
-\setcounter{enumiv}{0}
-\setcounter{footnote}{0}
-\setcounter{mpfootnote}{0}
-\setcounter{part}{0}
-\setcounter{section}{1}
-\setcounter{subsection}{0}
-\setcounter{subsubsection}{0}
-\setcounter{paragraph}{0}
-\setcounter{subparagraph}{0}
-\setcounter{figure}{0}
-\setcounter{table}{0}
-}
diff --git a/intro.tex.aux b/intro.tex.aux
deleted file mode 100644
index ffc8434..0000000
--- a/intro.tex.aux
+++ /dev/null
@@ -1,19 +0,0 @@
-\relax 
-\@setckpt{intro.tex}{
-\setcounter{page}{2}
-\setcounter{equation}{0}
-\setcounter{enumi}{0}
-\setcounter{enumii}{0}
-\setcounter{enumiii}{0}
-\setcounter{enumiv}{0}
-\setcounter{footnote}{0}
-\setcounter{mpfootnote}{0}
-\setcounter{part}{0}
-\setcounter{section}{0}
-\setcounter{subsection}{0}
-\setcounter{subsubsection}{0}
-\setcounter{paragraph}{0}
-\setcounter{subparagraph}{0}
-\setcounter{figure}{0}
-\setcounter{table}{0}
-}
diff --git a/main.log b/main.log
index 140c8d1..e4d2365 100644
--- a/main.log
+++ b/main.log
@@ -1,4 +1,4 @@
-This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex 2018.5.18)  1 MAY 2019 09:46
+This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex 2018.5.18)  1 MAY 2019 10:28
 entering extended mode
  restricted \write18 enabled.
  file:line:error style messages enabled.
diff --git a/main.pdf b/main.pdf
index 5ef7289..933869a 100644
Binary files a/main.pdf and b/main.pdf differ
diff --git a/main.synctex.gz b/main.synctex.gz
index f0a29ac..6af07d3 100644
Binary files a/main.synctex.gz and b/main.synctex.gz differ