●●● ●●●● ●●●●● ●●●● ●●●●● 1.5. 1 Conditional Probability ●●●● Conditioning is another of the fundamental tools of probability probably the most fundamental tool. It is especially helpful for calculating the probabilities of intersections, such as P(AnB Additionally, the whole field of stochastic processesl"机过程 is based on the idea of conditional probability. What happens next in a process depends, or is conditional, on what has happened beforehand1.5.1 Conditional Probability ⚫ Conditioning is another of the fundamental tools of probability: probably the most fundamental tool. It is especially helpful for calculating the probabilities of intersections, such as P(A∩B). ⚫ Additionally, the whole field of stochastic processes随机过程 is based on the idea of conditional probability. What happens next in a process depends, or is conditional, on what has happened beforehand