I am an UG senior year student, now applying to graduate schools.
One of my research experiences was in Theoretical CS. Although I find TCS quite tough, I approached a professor for working with them.
Considering that I was "new", most of my work involved literature review, and even though we had a few problem statements - we were unable to make any substantial progress towards any of them, despite working for almost two semesters.
This experience showed me I was not made for TCS, and I moved on to approach professors in other areas of CS. I have 3 other LoRs, which would be stronger than if this professor writes one, so they cannot address this issue.
My question is: Considering that this is indeed a research experience but one without any kind of "results": Should I mention this experience in my CV or SoP, and if so, how?