An abbreviation for highest common factor, also known as the greatest common divisor; the largest number that divides two or more numbers evenly.
Abbreviation of English mathematical terminology: 'highest common factor,' where 'common' means shared between numbers and 'factor' means a number that divides evenly.
The HCF concept is so useful that almost every mathematical system developed independently discovered it—ancient Euclidean geometry was literally built on finding HCFs, showing how mathematical principles are discovered rather than invented.
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