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I have read a lot about Diffusion Equation and solving neutron flux problems in different mediums, planes and groups, but I can't grasp this topic. In other words, I don't know why they mention:

1. Infinite/finite medium

2. Homogeneous/non-Homogenous medium

3. One/two or multi-group (what do they mean by group?)

I would appreciate it if someone could explain this topic with analogies. Thank you.

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# Diffusion Equation and Flux

**Physics Forums | Science Articles, Homework Help, Discussion**