Last spring, I did a research project where I tried to develop code, modelling a physical system using a method developed by a researcher and presented as his PhD. thesis.
Now I have completed my work and am required to present documentation of the theory used and the performance of code. Now, while I was explaining that paper, I did detailed derivations of all the steps taken which had been omitted from papers for brevity. These derivations I have put in the manual as well so that any other undergraduate trying to work with same paper can quickly get started.
However, is it plagiarism to upload such a manual on my homepage and GitHub repository where someone else did the hard work of deriving concepts in the thesis and I just present proof of intermediate steps?
I am unsure if this is a right practice even if I state that I am only explaining his derivation.
What else can be done to mitigate the copyright infringement? One option, I think, is to submit the report to my supervisor and he will personally distribute it to students in his research group who he thinks will benefit from it.