Is It Possible For People To Make Errors In Mathematics?

Aclidian geometry was traditionally always done in two dimensions on a piece of paper. It led to geometry in curved space, which led to einstein coming up with the general theory of relativity. Even in mathematics where we try and be as precise as possible, it's possible for people to make errors. N that calpopper has this wonderful saying: 'It is impossible to speak in such a way that you cannot be misunderstood'