[Ads-l] Quote Origin: A Mathematician Is a Machine Which Turns Coffee into Theorems

[ADSGarson O'Toole]

A discussion thread on BlueSky inspired an examination of the quip in
the subject line which is usually attributed to the brilliant and
prolific Hungarian mathematician Paul Erdős. The remark has also been
attributed to the prominent Hungarian mathematicians Alfréd Rényi and
Paul Turán.

"The New Yale Book of Quotations" has an excellent citation from
November 1987 that attributes the quote to Paul Erdős.

Now, I have found scans of a 1971 article by Erdős in which he
credited Alfréd Rényi.

The Quote Investigator article also explores variants about writers,
programmers, and lawyers. Here is a link:

https://quoteinvestigator.com/2026/06/13/mathematician-coffee/

Below is an overview showing 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)

Feedback welcome
Garson O'Toole

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