- #1
homomorphism
- 19
- 0
so i have a problem which can be formulated in the following way:
assume you have n particles and you know the initial position of each. There is some probability distribution P which contains the probability of having a particular velocity. Now, each particle has this same probability distribution of velocities. now choose some particle X and assume all other particles are moving toward X (for now we can assume X is still). In some time t, what is the expected number of collisions that X will have?
well, i know you can compute it by saying prob of s (s goes from 0 to n) particles hitting X and find expected value that way. but this requires a lot of computation. eg. if you want to compute prob of 1 particle hitting X, you need to compute probability of particle 1 hitting X and none others hitting X, or probability of particle 2 hitting and none others, or probabilty of particle 3, etc. and these all differ since they are at different places. is there some type of better way to formulate this?
assume you have n particles and you know the initial position of each. There is some probability distribution P which contains the probability of having a particular velocity. Now, each particle has this same probability distribution of velocities. now choose some particle X and assume all other particles are moving toward X (for now we can assume X is still). In some time t, what is the expected number of collisions that X will have?
well, i know you can compute it by saying prob of s (s goes from 0 to n) particles hitting X and find expected value that way. but this requires a lot of computation. eg. if you want to compute prob of 1 particle hitting X, you need to compute probability of particle 1 hitting X and none others hitting X, or probability of particle 2 hitting and none others, or probabilty of particle 3, etc. and these all differ since they are at different places. is there some type of better way to formulate this?