My former PhD supervisor has just published a paper on a scientific subject investigated by me in my thesis. The subject (or question posed), was an idea that I came up solely during my PhD and which I chose to investigate as a sub topic - my conclusions were published in my thesis in 2015 and I assume (from a legal statement in the thesis), that I own the copyright.
The paper just published has taken my hypothesis and explored it in more depth. Some of my studies have been repeated by other people in the lab. Moreover, some of the key conclusions made by me in my thesis have been made again. I have not been credited in any way.
Is this plagiarism and should I pursue this? I’ve left academia so no longer publish anyway.