Buffon’s needle problem
E636452
Buffon’s needle problem is a classic probability puzzle that involves dropping a needle on a lined surface to estimate the value of π.
All labels observed (6)
| Label | Occurrences |
|---|---|
| Buffon's law | 1 |
| Buffon's needle | 1 |
| Buffon's needle problem | 1 |
| Buffon’s needle experiment | 1 |
| Buffon’s needle problem canonical | 1 |
| probabilistic method known as Buffon's needle | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T7041154 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Buffon’s needle problem Context triple: [Buffon, knownFor, Buffon’s needle problem]
-
A.
Steinhaus chessboard theorem
The Steinhaus chessboard theorem is a combinatorial result in geometry and topology that gives conditions under which certain colored paths must exist on a checkerboard-like grid.
-
B.
Conway circle theorem
The Conway circle theorem is a geometric result in triangle geometry that identifies a special circle associated with a triangle and certain constructed points, revealing notable collinearities and concyclicity relationships.
-
C.
Eratosthenes spiral
The Eratosthenes spiral is a geometric visualization of prime numbers generated by the sieve of Eratosthenes, arranging integers in a spiral so that primes form distinctive radial patterns.
-
D.
Conway’s soldiers
Conway’s soldiers is a mathematical puzzle and thought experiment in combinatorial game theory that explores how far checkers-like pieces can advance on an infinite grid under specific movement rules.
-
E.
Erdős–Szekeres theorem
The Erdős–Szekeres theorem is a fundamental result in combinatorial geometry that guarantees the existence of large convex polygons within sufficiently large sets of points in the plane in general position.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Buffon’s needle problem Target entity description: Buffon’s needle problem is a classic probability puzzle that involves dropping a needle on a lined surface to estimate the value of π.
-
A.
Steinhaus chessboard theorem
The Steinhaus chessboard theorem is a combinatorial result in geometry and topology that gives conditions under which certain colored paths must exist on a checkerboard-like grid.
-
B.
Conway circle theorem
The Conway circle theorem is a geometric result in triangle geometry that identifies a special circle associated with a triangle and certain constructed points, revealing notable collinearities and concyclicity relationships.
-
C.
Eratosthenes spiral
The Eratosthenes spiral is a geometric visualization of prime numbers generated by the sieve of Eratosthenes, arranging integers in a spiral so that primes form distinctive radial patterns.
-
D.
Conway’s soldiers
Conway’s soldiers is a mathematical puzzle and thought experiment in combinatorial game theory that explores how far checkers-like pieces can advance on an infinite grid under specific movement rules.
-
E.
Erdős–Szekeres theorem
The Erdős–Szekeres theorem is a fundamental result in combinatorial geometry that guarantees the existence of large convex polygons within sufficiently large sets of points in the plane in general position.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Monte Carlo method example
ⓘ
geometric probability problem ⓘ probability puzzle ⓘ |
| appearsIn |
Monte Carlo methods courses
ⓘ
introductory probability textbooks ⓘ |
| assumes |
independent trials for each needle drop
ⓘ
needle is dropped with random position and orientation ⓘ parallel lines are equally spaced ⓘ |
| canEstimate | π ≈ 2L·(number of drops) / (T·number of crossings) ⓘ |
| category |
classical probability problem
ⓘ
stochastic simulation example ⓘ |
| demonstrates |
connection between geometry and probability
ⓘ
law of large numbers ⓘ |
| field |
geometric probability
ⓘ
mathematics ⓘ probability theory NERFINISHED ⓘ |
| hasAlternativeFormulation |
dropping a stick on floorboards
ⓘ
throwing a needle on ruled paper ⓘ |
| hasCondition | needle length less than or equal to line spacing ⓘ |
| hasFormula | P(cross) = 2L / (πT) for L ≤ T ⓘ |
| hasGeneralization |
Buffon–Laplace needle problem
NERFINISHED
ⓘ
problems with needle length greater than line spacing ⓘ |
| hasOutcome | probability depends on ratio L/T ⓘ |
| hasParameter |
distance between parallel lines
ⓘ
needle length ⓘ |
| historicalPeriod | 18th century ⓘ |
| introducedBy | Georges-Louis Leclerc, Comte de Buffon NERFINISHED ⓘ |
| involves |
dropping a needle onto a plane with parallel lines
ⓘ
estimating the probability of the needle crossing a line ⓘ |
| isTaughtIn |
courses on stochastic simulation
ⓘ
undergraduate probability courses ⓘ |
| namedAfter | Georges-Louis Leclerc, Comte de Buffon NERFINISHED ⓘ |
| relatedTo |
Buffon’s noodle problem
NERFINISHED
ⓘ
Monte Carlo integration NERFINISHED ⓘ estimation of irrational constants ⓘ geometric probability integral ⓘ |
| requires |
uniform distribution of needle angle
ⓘ
uniform distribution of needle center position ⓘ |
| solutionInvolves |
integration over angle and distance
ⓘ
trigonometric functions ⓘ |
| symbolUses |
L for needle length
ⓘ
T for distance between lines ⓘ π for pi ⓘ |
| usedFor |
demonstrating experimental probability
ⓘ
estimating the value of π ⓘ illustrating Monte Carlo estimation ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Buffon’s needle problem Description of subject: Buffon’s needle problem is a classic probability puzzle that involves dropping a needle on a lined surface to estimate the value of π.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Georges-Louis Leclerc, Comte de Buffon
this entity surface form:
Buffon's needle
subject surface form:
Georges-Louis Leclerc, Comte de Buffon
this entity surface form:
Buffon's law
subject surface form:
Georges-Louis Leclerc, Comte de Buffon
this entity surface form:
Buffon's needle problem
subject surface form:
Georges-Louis Leclerc, Comte de Buffon
this entity surface form:
probabilistic method known as Buffon's needle