````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 ``