HCF
Redirected to greatest common divisor.
GCD
Redirected to greatest common divisor.
Greatest common divisor
The largest positive integer that divides each of the integers in a set without leaving a remainder.
Roman numerals
System of using letters to represent numbers, an idea that was developed by the Phoenicians two thousand years before the founding of the city of Rome.
Sample size fallacy
Failure to consider sample size when estimating the probability of obtaining a particular value drawn from a known population.
Fantasia Mathematica
Anthology of stories, humour, poems, etc. on mathematical topics, published in 1958.
Mathematical fallacy
Series of steps which is seemingly correct but contains a flawed argument, or a spurious proof of an obvious contradiction such as that 1 = 2. Fallacies differ from simple mistakes in that there is an element of concealment in the presentation of the proof.
Numerology
Modern successor to arithmomancy, embodying the belief that numbers can explain the workings of the universe and thus allow predictions to be made.
Prime number
Any positive integer greater than zero that has only two proper divisors, 1 and the number itself. Thus the lowest prime number is 2, which is also the only even prime.
Perfect number
A perfect number is a positive integer the sum of whose proper divisors is equal to the number itself.
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