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Italian mathematician, logician, and one of the founders of modern mathematical logic and set theory.

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Certainly it is permitted to anyone to put forward whatever hypotheses he wishes, and to develop the logical consequences contained in those hypotheses. But in order that this work merit the name of Geometry, it is necessary that these hypotheses or postulates express the result of the more simple and elementary observations of physical figures.

I am fascinated by his gentle personality, his ability to attract lifelong disciples, his tolerance of human weakness, his perennial optimism. ... Peano may not only be classified as a 19th century mathematician and logician, but because of his originality and influence, must be judged one of the great scientists of that century.

0 is a number.

2. The immediate successor of a number is also a number.

3. 0 is not the immediate successor of any number.

4. No two numbers have the same immediate successor.

5. Any property belonging to 0 and to the immediate successor of any number that also has that property belongs to all numbers.

2. The immediate successor of a number is also a number.

3. 0 is not the immediate successor of any number.

4. No two numbers have the same immediate successor.

5. Any property belonging to 0 and to the immediate successor of any number that also has that property belongs to all numbers.

Peano — whether in Logic or in Mathematics — never worked with pure symbolism — he always required that the primitive symbols introduced represent intuitive ideas to be explained with ordinary language.

Zero is a number.

2. The successor of any number is another number.

3. There are no two numbers with the same successor.

4. Zero is not the successor of a number.

5. Every property of zero, which belongs to the successor of every number with this property, belongs to all numbers.

2. The successor of any number is another number.

3. There are no two numbers with the same successor.

4. Zero is not the successor of a number.

5. Every property of zero, which belongs to the successor of every number with this property, belongs to all numbers.

Bertrand Russell never wavered in acknowledging his intellectual debt to Giuseppe Peano. In many ways the contribution that Russell made to the foundations of mathematics, culminating in Principia Mathematica, strongly bears Peano's mark.

In every science, after having analysed the ideas, expressing the more complicated by means of the more simple, one finds a certain number that cannot be reduced among them, and that one can define no further. These are the primitive ideas of the science; it is necessary to acquire them through experience, or through induction; it is impossible to explain them by deduction.

He was a man I greatly admired from the moment I met him for the first time in 1900 at a Congress of Philosophy, which he dominated by the exactness of his mind.

These primitive propositions ... suffice to deduce all the properties of the numbers that we shall meet in the sequel. There is, however, an infinity of systems which satisfy the five primitive propositions. ... All systems which satisfy the five primitive propositions are in one-to-one correspondence with the natural numbers. The natural numbers are what one obtains by abstraction from all these systems; in other words, the natural numbers are the system which has all the properties and only those properties listed in the five primitive propositions

Geometric calculus consists in a system of operations analogous to those of algebraic calculus, but in which the entities on which the calculations are carried out, instead of being numbers, are geometric entities which we shall define.

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Payne Smith, Robert

Payne, C. F.

Payne, John Howard

Payne, Pierre Stephen Robert

Payne, Rob

Payson, Edward

Paz, Octavio

Peacock, Thomas Love

Peake, Mervyn

Peale, Norman Vincent

Pearl Poet

Pearl, Minnie

Pearse, Patrick

Pearson, Kevin W.

Pearson, Lester B.

Peart, Neil

Peck, Gregory

Peck, Ralph Brazelton

Pedersen, Charles J.

Payne, C. F.

Payne, John Howard

Payne, Pierre Stephen Robert

Payne, Rob

Payson, Edward

Paz, Octavio

Peacock, Thomas Love

Peake, Mervyn

Peale, Norman Vincent

**Peano, Giuseppe**

Pearl Poet

Pearl, Minnie

Pearse, Patrick

Pearson, Kevin W.

Pearson, Lester B.

Peart, Neil

Peck, Gregory

Peck, Ralph Brazelton

Pedersen, Charles J.

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