Frasi di Terence Tao

“Understand the problem. What kind of problem is it? There are three main types of problems:
‘Show that …’ or ‘Evaluate …’ questions, in which a certain statement has to be proved true, or a certain expression has to be worked out;
‘Find a…’ or ‘Find all…’ questions, which requires one to find something (or everything) that satisfies certain requirements;
‘Is there a …’ questions, which either require you to prove a statement or provide a counterexample”