Pierre de Fermat

Mathematics French 1601 – 1665 270 quotes

Father of modern number theory

Quotes by Pierre de Fermat

I have discovered a truly marvelous proof of this, which this margin is too narrow to contain.

Marginalia in his copy of Diophantus' Arithmetica

It is impossible to separate a cube into two cubes, or a fourth power into two fourth powers, or in general, any power higher than the second into two like powers. I have discovered a truly marvelous proof of this, which this margin is too narrow to contain.

Marginalia in his copy of Diophantus' Arithmetica

To divide a given number into two cubes, or two fourth powers, or two fifth powers, etc., is impossible for any power greater than the second.

Marginalia in his copy of Diophantus' Arithmetica

I am astonished that these propositions, which are so easy to state, are so difficult to prove.

Letter to Christiaan Huygens

I have found a great number of very beautiful theorems of arithmetic.

Letter to Marin Mersenne

The last theorem of Fermat, as it is called, has tormented mathematicians for centuries.

Commonly attributed to discussions around Fermat's Last Theorem, not a direct quote from Fermat himself but a reflection of his impact.

The method of maxima and minima, which I have found, is general and applies to all kinds of problems.

Methodus ad disquirendam maximam et minimam

I have found a method of determining the tangents to all kinds of curves.

Methodus ad disquirendam maximam et minimam

The path of light between two points is that which takes the least time.

Principle of Least Time (Fermat's Principle)

Nature always acts by the shortest path.

Principle of Least Time (Fermat's Principle)

I have found a method of determining the center of gravity of any figure.

Various letters and papers

I have discovered a method of finding the area of any curve.

Various letters and papers

Every number which is not a square is the sum of two squares.

Incorrectly attributed, likely a misremembering of a theorem by another mathematician or a misunderstanding of one of Fermat's theorems.

Every prime number of the form 4n+1 is uniquely the sum of two squares.

Letter to Marin Mersenne

If p is a prime number, then for any integer a not divisible by p, we have a^(p-1) ≡ 1 (mod p).

Letter to Bernard Frénicle de Bessy

I have discovered a method of finding the integral of any power of x.

Various letters and papers

The theory of numbers has a charm of its own, which is not found in other branches of mathematics.

Commonly attributed, reflecting his passion for number theory.

I have found a method of finding the tangents to all kinds of curves, and of determining their maxima and minima.

Methodus ad disquirendam maximam et minimam

I have found a method of finding the area of any curve, and of determining its center of gravity.

Various letters and papers

I have discovered a method of finding the integral of any power of x, and of determining its maxima and minima.

Various letters and papers