我们可以从下面这个故事中了解什么是理想推理法.相传牛顿曾研究过这样一个问题:人掷出去的石头总会偏离掷出方向落回地面.于是牛顿提出了一个“大炮”的设想,原理如图1所示:在一座高山上架起一门大炮,以不同的速度将炮弹平射出去,炮弹射出的速度越大,炮弹落地点就离山脚越远.他推想:当射出的速度足够大时,炮弹将不再落回地面,而是绕地球旋转,做圆周运动.这就是著名的 We can learn from the story below that what is ideal reasoning is said to have been dealt with by Newton in the sense that the stone thrown by a human always falls off the ground in the direction of throwing and Newton proposes a “cannon” , The principle shown in Figure 1: Set up a cannon on a mountain, at different speeds will be fired out of shells, shells shot the greater the distance, the farther the bullet falling from the foothills he thought: When the injection speed is sufficient Large, the shells will no longer fall back to the ground, but around the earth rotation, do circular motion .This is the famous