What would likely be the thing that Nietzsche and Einstein would argue about if they had met?
It is difficult to say for certain what Nietzsche and Einstein would argue about if they had met, as their respective areas of expertise and philosophical interests were quite different. However, one possible point of contention between them could be their views on the nature of reality.
Nietzsche was a philosopher who rejected the idea of objective truth and believed that reality was fundamentally subjective and shaped by our own individual perspectives and interpretations. He saw language and culture as powerful forces that influenced how we perceive the world and argued that there is no fixed or absolute reality outside of our own experiences.
Einstein, on the other hand, was a physicist who developed the theory of relativity, which asserts that space and time are not absolute, but are relative to the observer's frame of reference. While Einstein's theory does not necessarily contradict Nietzsche's views on the subjectivity of reality, it does suggest that there are objective laws of nature that govern the behavior of matter and energy.
Given these different perspectives, Nietzsche and Einstein might have had a lively debate about the nature of reality, the limits of human knowledge, and the relationship between science and philosophy.