Paul Erdős? Alfréd Rényi? Jane Philcox? Suzy Schultz? Scott Westerfeld? Anonymous?

Question for Quote Investigator: Three outstanding mathematicians have been credited with the following humorous remark about their profession:
A mathematician is a machine for turning coffee into theorems.
This statement is usually attributed to the brilliant and prolific Hungarian mathematician Paul Erdős. Yet, it has also been attributed to the prominent Hungarian mathematicians Alfréd Rényi and Paul Turán. Would you please help to determine the originator?
Also, would you please explore the variant quips about writers, programmers, lawyers, and others.
Reply from Quote Investigator: The earliest match known to QI appeared in a paper delivered by Paul Erdős in 1971 titled “Child Prodigies” at “The Washington State University Conference on Number Theory”. Erdős spoke about his experience providing coffee to a youthful aspiring mathematician. Boldface added to excerpts by QI:1
In Hungary, many mathematicians drink strong coffee, in fact Rényi once said: a mathematician is a machine which turns coffee into theorems, at the mathematical institute they make particularly good coffee, when Pósa was not quite 14 I offered him a little strong coffee which he drank with an infinite amount of sugar. My mother was very angry that I gave the little boy strong coffee.
Based on this citation, Alfréd Rényi is the leading candidate for creator of this expression. Erdős was the most significant popularizer, and nowadays he often incorrectly receives credit. Erdős referred to Lajos Pósa in the passage above. Pósa became a well-known educator in mathematics.
Below is an overview showing variants with attributions and dates:
1971: A mathematician is a machine which turns coffee into theorems (Attributed to Alfréd Rényi by Paul Erdős)
1984: A mathematician is a machine for converting coffee into theorems (Attributed to an unnamed colleague of Paul Erdős)
1987 Nov: A mathematician is a machine for turning coffee into theorems (Attributed to Paul Erdős)
1991 May 15: A programmer is a machine for converting coffee into code (Usenet poster Jane Philcox)
1997 Aug 15: A programmer is a machine for turning beer into code (Usenet poster Matt Simpson)
2003 Jan 15: A programmer is a device for turning computer programs into spaghetti (Usenet poster H. S. Teoh)
2004: Her brain was nothing but a machine for turning coffee into special effects (Novelist Scott Westerfeld)
2000 Oct 03: A computer programmer is a device for turning coffee into bugs (Attributed to Bram Moolenaar by Usenet poster Arnaud S. Launay)
2008 Jan 21: A writer is a machine for turning coffee into poems (X-Twitter handle Suzy @Suzy_Schultz)
2009 Apr 07: A writer is a device for turning coffee into prose (X-Twitter handle John Ochwat @jjochwat)
2009 Jul 22: A programmer is a machine for turning caffeine, sugar and/or cigarettes into awkward and cryptic text files (X-Twitter handle Nigel F. Kennedy @nfkennedy)
2009 Jul 22: A Software Development Engineer … is a biological machine for turning snacks & beverages into software systems. (X-Twitter handle Ravi Mandala @rmandala)
2009 Sep 07: A writer is a machine for turning tea into descriptions (Attributed to Jim Rossignol by X-Twitter handle Dave McLeod @davemcleod)
2020 Nov 24: The brain is a machine for turning glucose into mistakes (X-Twitter handle Neuroskeptic @Neuro_Skeptic)
2024 Feb 28: “lawyer: a machine for turning coffee into billable hours” (Attributed to an anonymous lawyer by X-Twitter handle Gabriel @gbrl_dick)
Below are details for selected citations in chronological order.
Continue reading “Quote Origin: A Mathematician Is a Machine Which Turns Coffee into Theorems”







