Last Theorem.
One method of performing this action involves using a base case and an induction step; another method begins by assuming the opposite and finding something impossible, which is the type "by contradiction". In 1994 Andrew Wiles did this for (*) Fermat's [fair-mah'z] Last Theorem. Basic geometry often uses the "two-column" variety of, for 10 points, what process of showing that a mathematical statement is true?
One method of performing this action involves using a base case and an induction step; another method begins by assuming the opposite and finding something impossible, which is the type "by contradiction".
mathematical proof [accept word forms]