diff --git a/arbremaster.obj b/arbremaster.obj
new file mode 100644
index 0000000000000000000000000000000000000000..b5907a247e14cc2c5f26f257d7af824928bcbd7c
--- /dev/null
+++ b/arbremaster.obj
@@ -0,0 +1,202 @@
+%TGIF 4.2.5-QPL
+state(0,37,100.000,0,0,0,16,1,0,1,1,2,0,1,1,1,0,'Courier',0,138240,0,0,1,10,0,0,1,1,0,16,0,0,1,1,1,1,1050,1485,1,0,2880,0).
+%
+% @(#)$Header$
+% %W%
+%
+unit("1 pixel/pixel").
+color_info(50,65535,0,[
+	"Black", 0, 0, 0, 0, 0, 0, 1,
+	"White", 65535, 65535, 65535, 65535, 65535, 65535, 1,
+	"#000080", 0, 0, 32896, 0, 0, 32768, 1,
+	"#008000", 0, 32896, 0, 0, 32768, 0, 1,
+	"#008080", 0, 32896, 32896, 0, 32768, 32768, 1,
+	"#800000", 32896, 0, 0, 32768, 0, 0, 1,
+	"#800080", 32896, 0, 32896, 32768, 0, 32768, 1,
+	"#ff8000", 65535, 32896, 0, 65280, 32768, 0, 1,
+	"#808080", 32896, 32896, 32896, 32768, 32768, 32768, 1,
+	"#c0c0c0", 49344, 49344, 49344, 49152, 49152, 49152, 1,
+	"#0000ff", 0, 0, 65535, 0, 0, 65280, 1,
+	"#00ff00", 0, 65535, 0, 0, 65280, 0, 1,
+	"#00ffff", 0, 65535, 65535, 0, 65280, 65280, 1,
+	"#ff0000", 65535, 0, 0, 65280, 0, 0, 1,
+	"#ff00ff", 65535, 0, 65535, 65280, 0, 65280, 1,
+	"#ffff00", 65535, 65535, 0, 65280, 65280, 0, 1,
+	"#4c4c4c", 19532, 19532, 19532, 19456, 19456, 19456, 1,
+	"#b3b3b3", 46003, 46003, 46003, 45824, 45824, 45824, 1,
+	"#e6e6e6", 59110, 59110, 59110, 58880, 58880, 58880, 1,
+	"#dc2300", 56540, 8995, 0, 56320, 8960, 0, 1,
+	"#ff3333", 65535, 13107, 13107, 65280, 13056, 13056, 1,
+	"#b84747", 47288, 18247, 18247, 47104, 18176, 18176, 1,
+	"#99284c", 39321, 10280, 19532, 39168, 10240, 19456, 1,
+	"#94476b", 38036, 18247, 27499, 37888, 18176, 27392, 1,
+	"#9966cc", 39321, 26214, 52428, 39168, 26112, 52224, 1,
+	"#6b2394", 27499, 8995, 38036, 27392, 8960, 37888, 1,
+	"#5e11a6", 24158, 4369, 42662, 24064, 4352, 42496, 1,
+	"#4700b8", 18247, 0, 47288, 18176, 0, 47104, 1,
+	"#2323dc", 8995, 8995, 56540, 8960, 8960, 56320, 1,
+	"#0099ff", 0, 39321, 65535, 0, 39168, 65280, 1,
+	"#99ccff", 39321, 52428, 65535, 39168, 52224, 65280, 1,
+	"#00dcff", 0, 56540, 65535, 0, 56320, 65280, 1,
+	"#23b8dc", 8995, 47288, 56540, 8960, 47104, 56320, 1,
+	"#33a3a3", 13107, 41891, 41891, 13056, 41728, 41728, 1,
+	"#355e00", 13621, 24158, 0, 13568, 24064, 0, 1,
+	"#7da647", 32125, 42662, 18247, 32000, 42496, 18176, 1,
+	"#00ae00", 0, 44718, 0, 0, 44544, 0, 1,
+	"#3deb3d", 15677, 60395, 15677, 15616, 60160, 15616, 1,
+	"#ffff99", 65535, 65535, 39321, 65280, 65280, 39168, 1,
+	"#e6e64c", 59110, 59110, 19532, 58880, 58880, 19456, 1,
+	"#b3b300", 46003, 46003, 0, 45824, 45824, 0, 1,
+	"#666600", 26214, 26214, 0, 26112, 26112, 0, 1,
+	"#4c1900", 19532, 6425, 0, 19456, 6400, 0, 1,
+	"#663300", 26214, 13107, 0, 26112, 13056, 0, 1,
+	"#804c19", 32896, 19532, 6425, 32768, 19456, 6400, 1,
+	"#996633", 39321, 26214, 13107, 39168, 26112, 13056, 1,
+	"#cc6633", 52428, 26214, 13107, 52224, 26112, 13056, 1,
+	"#ff6633", 65535, 26214, 13107, 65280, 26112, 13056, 1,
+	"#ff9966", 65535, 39321, 26214, 65280, 39168, 26112, 1,
+	"#ffcc99", 65535, 52428, 39321, 65280, 52224, 39168, 1
+]).
+script_frac("0.6").
+fg_bg_colors('Black','white').
+dont_reencode("FFDingbests:ZapfDingbats").
+objshadow_info('#c0c0c0',2,2).
+rotate_pivot(0,0,0,0).
+spline_tightness(1).
+page(1,"",1,'').
+group([
+polygon('#0099ff','',13,[
+	150,196,150,234,150,250,166,250,284,250,300,250,300,234,300,196,
+	300,180,284,180,166,180,150,180,150,196],1,1,1,0,0,0,0,0,0,0,'1',0,
+    "2490",[
+]),
+box('#0099ff','',154,184,296,246,1,1,0,1,0,0,0,0,0,'1',0,[
+attr("", "auto_center_attr", 0, 1, 0,
+text('#0099ff',225,183,1,1,1,144,15,2,12,3,0,0,0,0,-65534,144,15,0,0,"",0,0,0,0,195,'',[
+minilines(144,15,0,0,1,0,0,[
+mini_line(144,12,3,0,0,0,[
+str_block(0,144,12,3,0,-1,0,0,0,[
+str_seg('#0099ff','Courier',0,80640,144,12,3,0,-1,0,0,0,0,0,
+	"auto_center_attr")])
+])
+])])),
+attr("label=", "f9003eb", 1, 0, 0,
+text('#0099ff',225,200,1,1,1,90,29,3,24,5,0,0,0,0,-65534,90,29,0,0,"",0,0,0,0,224,'',[
+minilines(90,29,0,0,1,0,0,[
+mini_line(90,24,5,0,0,0,[
+str_block(0,90,24,5,0,-1,0,0,0,[
+str_seg('White','Helvetica-Bold',1,138240,90,24,5,0,-1,0,0,0,0,0,
+	"f9003eb")])
+])
+])]))
+])
+],
+4,0,0,[
+]).
+group([
+polygon('#0099ff','',13,[
+	400,196,400,234,400,250,416,250,534,250,550,250,550,234,550,196,
+	550,180,534,180,416,180,400,180,400,196],1,1,1,0,33,0,0,0,0,0,'1',0,
+    "2490",[
+]),
+box('#0099ff','',404,184,546,246,1,1,0,34,0,0,0,0,0,'1',0,[
+attr("", "auto_center_attr", 0, 1, 0,
+text('#0099ff',475,183,1,1,1,144,15,35,12,3,0,0,0,0,-65534,144,15,0,0,"",0,0,0,0,195,'',[
+minilines(144,15,0,0,1,0,0,[
+mini_line(144,12,3,0,0,0,[
+str_block(0,144,12,3,0,-1,0,0,0,[
+str_seg('#0099ff','Courier',0,80640,144,12,3,0,-1,0,0,0,0,0,
+	"auto_center_attr")])
+])
+])])),
+attr("label=", "42b8626", 1, 0, 0,
+text('#0099ff',474,200,1,1,1,93,29,36,24,5,0,0,0,0,-65534,93,29,0,0,"",0,0,0,0,224,'',[
+minilines(93,29,0,0,1,0,0,[
+mini_line(93,24,5,0,0,0,[
+str_block(0,93,24,5,0,-1,0,0,0,[
+str_seg('White','Helvetica-Bold',1,138240,93,24,5,0,-1,0,0,0,0,0,
+	"42b8626")])
+])
+])]))
+])
+],
+32,0,0,[
+]).
+group([
+polygon('#0099ff','',13,[
+	650,196,650,234,650,250,666,250,784,250,800,250,800,234,800,196,
+	800,180,784,180,666,180,650,180,650,196],1,1,1,0,43,0,0,0,0,0,'1',0,
+    "2490",[
+]),
+box('#0099ff','',654,184,796,246,1,1,0,44,0,0,0,0,0,'1',0,[
+attr("", "auto_center_attr", 0, 1, 0,
+text('#0099ff',725,183,1,1,1,144,15,45,12,3,0,0,0,0,-65534,144,15,0,0,"",0,0,0,0,195,'',[
+minilines(144,15,0,0,1,0,0,[
+mini_line(144,12,3,0,0,0,[
+str_block(0,144,12,3,0,-1,0,0,0,[
+str_seg('#0099ff','Courier',0,80640,144,12,3,0,-1,0,0,0,0,0,
+	"auto_center_attr")])
+])
+])])),
+attr("label=", "09e6e96", 1, 0, 0,
+text('#0099ff',724,200,1,1,1,93,29,46,24,5,0,0,0,0,-65534,93,29,0,0,"",0,0,0,0,224,'',[
+minilines(93,29,0,0,1,0,0,[
+mini_line(93,24,5,0,0,0,[
+str_block(0,93,24,5,0,-1,0,0,0,[
+str_seg('White','Helvetica-Bold',1,138240,93,24,5,0,-1,0,0,0,0,0,
+	"09e6e96")])
+])
+])]))
+])
+],
+42,0,0,[
+]).
+poly('Black','',2,[
+	400,220,300,220],1,3,1,55,0,1,0,0,0,0,0,'3',0,0,
+    "0","",[
+    0,12,5,0,'12','5','0'],[0,12,5,0,'12','5','0'],[
+]).
+poly('Black','',2,[
+	650,220,550,220],1,3,1,56,0,1,0,0,0,0,0,'3',0,0,
+    "0","",[
+    0,12,5,0,'12','5','0'],[0,12,5,0,'12','5','0'],[
+]).
+group([
+polygon('#ff8000','',13,[
+	650,46,650,84,650,100,666,100,784,100,800,100,800,84,800,46,
+	800,30,784,30,666,30,650,30,650,46],1,1,1,0,75,0,0,0,0,0,'1',0,
+    "2490",[
+]),
+box('#ff8000','',654,34,796,96,1,1,0,76,0,0,0,0,0,'1',0,[
+attr("", "auto_center_attr", 0, 1, 0,
+text('#0099ff',725,33,1,1,1,144,15,77,12,3,0,0,0,0,-65534,144,15,0,0,"",0,0,0,0,45,'',[
+minilines(144,15,0,0,1,0,0,[
+mini_line(144,12,3,0,0,0,[
+str_block(0,144,12,3,0,-1,0,0,0,[
+str_seg('#0099ff','Courier',0,80640,144,12,3,0,-1,0,0,0,0,0,
+	"auto_center_attr")])
+])
+])])),
+attr("label=", "master", 1, 0, 0,
+text('#0099ff',724,50,1,1,1,81,29,78,24,5,0,0,0,0,-65534,81,29,0,0,"",0,0,0,0,74,'',[
+minilines(81,29,0,0,1,0,0,[
+mini_line(81,24,5,0,0,0,[
+str_block(0,81,24,5,0,-1,0,0,0,[
+str_seg('White','Helvetica-Bold',1,138240,81,24,5,0,-1,0,0,0,0,0,
+	"master")])
+])
+])]))
+])
+],
+74,0,0,[
+]).
+poly('Black','',2,[
+	730,100,730,180],1,3,1,89,0,1,0,0,0,0,0,'3',0,0,
+    "0","",[
+    0,12,5,0,'12','5','0'],[0,12,5,0,'12','5','0'],[
+]).
+poly('Black','',2,[
+	150,220,50,220],1,3,1,96,0,1,2,0,0,0,0,'3',0,0,
+    "0","",[
+    0,12,5,0,'12','5','0'],[0,12,5,0,'12','5','0'],[
+]).
diff --git a/git.tex b/git.tex
index e195d362c09c50e229e88b0e6d9012535f94501b..55369e0d34b44c51eee471250c6023dbdceeb791 100644
--- a/git.tex
+++ b/git.tex
@@ -1466,6 +1466,23 @@
   \end{center}
 }
 
+%======================================================================
+
+\frame{\frametitle{Introduction}
+  \begin{itemize}
+  \item
+    Comme indiqué précédemment, la création d'un dépôt git entraîne
+    automatiquement la création d'une branche par défaut, appelée
+    \ex{master}
+  \item
+    Techniquement, cette branche correspond à une variable \ex{master}
+    pointant toujours vers le dernier commit réalisé
+  \end{itemize}
+  \begin{center}
+    \includegraphics[scale=.4]{arbremaster.eps}
+  \end{center}
+}
+
 %======================================================================
 
     \mygit{git branch}{gitbranch1.txt}