8 16-1 Notations and definitions Seven-bridge problem A You are asked to set off from any piece of the lands and pass B through all the seven bridges under the condition that each bridge can be used only once, so hat you can finally return to the starting point. The mathematician Euler pointed out: B The problem with remain insoluble unless each piece of land could be D connected with even numbers of bridgesThe mathematician Euler pointed out: The problem with remain insoluble unless each piece of land could be connected with even numbers of bridges. A B C D A D B C §16-1 Notations and definitions Seven-bridge problem: You are asked to set off from any piece of the lands and pass through all the seven bridges under the condition that each bridge can be used only once, so that you can finally return to the starting point