Universal Decimal Classification May 2026

The UDC divides all human knowledge into ten main "houses" (classes), numbered 0 to 9:

Using symbols like colons (:) or pluses (+) to show how different subjects—like Physics and Medicine —linked together to form new ideas like Biophysics . The System: A Mathematical Map of Mind universal decimal classification

To make this work, they needed a classification system that was: The UDC divides all human knowledge into ten

Able to cover every field of knowledge, from Philosophy to Engineering. In 1895, they founded the Mundaneum in Mons,

Otlet and La Fontaine didn't just want a library; they wanted a "city of knowledge". In 1895, they founded the Mundaneum in Mons, Belgium—a pre-digital precursor to Google.

Their quest to catalog every piece of human thought led to the creation of the , a system built on the bones of the Dewey Decimal Classification but designed for far more than just books. The Vision: The Mundaneum

Using numbers that any person, regardless of language, could understand.

The UDC divides all human knowledge into ten main "houses" (classes), numbered 0 to 9:

Using symbols like colons (:) or pluses (+) to show how different subjects—like Physics and Medicine —linked together to form new ideas like Biophysics . The System: A Mathematical Map of Mind

To make this work, they needed a classification system that was:

Able to cover every field of knowledge, from Philosophy to Engineering.

Otlet and La Fontaine didn't just want a library; they wanted a "city of knowledge". In 1895, they founded the Mundaneum in Mons, Belgium—a pre-digital precursor to Google.

Their quest to catalog every piece of human thought led to the creation of the , a system built on the bones of the Dewey Decimal Classification but designed for far more than just books. The Vision: The Mundaneum

Using numbers that any person, regardless of language, could understand.