## Who is Raphael M. Robinson?

Raphael Mitchel Robinson (November 2, 1911 – January 27, 1995) was an American mathematician. Born in National City, California, Robinson was the youngest of four children of a lawyer and a teacher. He was awarded from the University of California, Berkeley in mathematics: the BA (1932), MA (1933), and Ph.D. (1935). His Ph.D. thesis, on complex analysis, was titled Some results in the theory of Schlicht functions. In 1941, Robinson married his former student Julia Bowman. She became his Berkeley colleague and the first woman president of the American Mathematical Society. Robinson worked on mathematical logic, set theory, geometry, number theory, and combinatorics. In 1937 he set out a simpler and more conventional version of the John von Neumann 1923 axiomatic set theory. Soon after Alfred Tarski joined Berkeley's mathematics department in 1942, Robinson began to do major work on the foundations of mathematics, building on Tarski's concept of essential undecidabilility, by proving a number of mathematical theories undecidable. In 1950 Robinson proved that an essentially undecidable theory need not have an infinite number of axioms by coming up with a counterexample: Robinson arithmetic Q. Q is finitely axiomatizable because it lacks Peano arithmetic's axiom schema of induction; nevertheless Q, like Peano arithmetic, is incomplete and undecidable in the sense of Gödel. Robinson's work on undecidability culminated in his coauthoring Tarski et al. (1953), which established, among other things, the undecidability of group theory, lattice theory, abstract projective geometry, and closure algebras. Robinson worked in number theory, even employing very early computers to obtain results. For example, he coded the Lucas–Lehmer primality test to determine whether 2n − 1 was prime for all prime n < 2304 on a SWAC. In 1952, he showed that these Mersenne numbers were all composite except for 17 values of n = 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, 107, 127, 521, 607, 1279, 2203, 2281. He discovered the last five of these Mersenne primes, the largest ones known at the time. Robinson wrote several papers on tilings of the plane, in particular a clear and remarkable 1971 paper Undecidability and nonperiodicity for tilings of the plane simplifying what had been a tangled theory. Robinson became a full professor at Berkeley in 1949, retired in 1973, and remained active in his educational interests for the duration of his life having published late in his life: (age 80 years) Minsky's small universal Turing machine, describing a universal Turing machine with four symbols and seven states; (age 83 years) Two figures in the hyperbolic plane.

## In What Year(When) Raphael M. Robinson Died? Date of Death, What Year Did He Die?

In what year Raphael M. Robinson died, in which year he died, questions such as the date of death are being wondered. Raphael M. Robinson passed away in **1995**. Raphael M. Robinson full date of death is **26 January 1995**. Raphael M. Robinson passed away on this date. In what year Raphael M. Robinson died, the answer to the question is 1995.

## How old was Raphael M. Robinson when died?

Raphael M. Robinson died in 1995. Raphael M. Robinson was 83 when he died.

## How many years ago did Raphael M. Robinson die?

Raphael M. Robinson died in 1995. So since we are now in 2022, Raphael M. Robinson passed away about 27 years ago.

### How many days has Raphael M. Robinson been dead?

It has been approximately 10171 days since Raphael M. Robinson died.

### How many months has it been since Raphael M. Robinson died?

Raphael M. Robinson has been dead approximately 339 months.

## Where did Raphael M. Robinson die? Place of Death

Raphael M. Robinson closed his eyes on 26 January 1995 at **Berkeley, California**. The place of death is Berkeley, California.

## When was Raphael M. Robinson born?

Raphael M. Robinson was born on 01 November 1911. Raphael M. Robinson was born in 1911.

## Where was Raphael M. Robinson Born? Place of birth

Raphael M. Robinson opened its eyes on 01 November 1911 at **National City, California**. Place of birth is National City, California.

## How old would Raphael M. Robinson be today if were alive?

Raphael M. Robinson, who died in 1995, would have been ** 110 ** if were alive today.

## Is Raphael M. Robinson Dead?

Raphael M. Robinson died in 1995. Is Raphael M. Robinson dead? The answer to the question is Yes.