````定理的“异向”两种三类分弧情形，可图示为

 文本格式文图编号＿图3——甲：

∣￣￣￣￣￣￣∣￣￣￣￣﹨`````∣￣￣￣￣￣￣∣￣￣￣￣﹨``````∣￣￣￣￣￣￣∣￣￣￣￣﹨

∣````````````∣B`※`````∣````∣````````````∣B`※`````∣`````∣````````````∣B````````∣

∣`````∕￣∕￣￣￣﹨````∣````∣`````∕￣∣￣￣￣﹨````∣`````∣`````∕￣﹨￣￣￣﹨````∣

∣````∕※∕d```````∣```∣````∣````∕```∣d``````∣```∣`````∣````∕```d`﹨`※``∣```∣

∣````∣`∕`````````∣```∣````∣````∣```∣```````∣```∣`````∣````∣```````﹨```∣```∣

∣````∣∕``````````∣```∣````∣````∣`※∣```````∣```∣`````∣````∣````````﹨``∣```∣

∣```A∣e```````````∕```∣````∣````∣```∣```````∣```∣`````∣````∣``````````﹨∣```∣
∣——﹨```````````∕````∣````∣——﹨```∣e`````∕````∣`````∣——﹨``````````e∕````∣

∣`※`A`￣￣￣￣￣﹨C````∣````∣````A``￣￣￣￣￣﹨C```∣`````∣`※`A``￣￣￣￣￣﹨C```∣
∣＿＿＿＿＿＿＿＿＿﹨＿∕`````∣＿＿＿＿＿＿＿＿＿﹨＿∕``````∣＿＿＿＿＿＿＿＿＿﹨＿∕

该图表示B~C∧C~A＜右d~e```````该图表示 B~C＜右d~e````````````该图表示 C~A＜左d~e ``