During my PhD, my supervisor wasn't very helpful. Now I have finished my PhD but I still have plenty of ideas (improvements) about my PhD topic that I can transform to papers and be published.
these ideas are not included in my PhD thesis (just personal notes I took during my study), but their topic is very similar to the topic of my PhD (which was proposed by my supervisor!).
Now, my new papers (completely written by me) are based on my previous work (I would use theoretical frameworks, results, ...), can I publish them alone (me being the only author without my supervisor's name as a co-author)? should I involve my supervisor in my paper since my research is a continuation of my previous work with him?
I will give credit to our previous work together in the paper, I will acknowledge the financial support of my PhD university, but I believe that should be all.