Luhmann's Zettelkasten operated through a hierarchical numbering system where each card contained one atomic idea, new cards branched with modifiers (e.g., 1, 1A, 1A1), and cross-references were manually written on both cards to create bidirectional links across the 90,000-card database.
factualpending
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Anil NattuEvidence Quote
“Each individual card contained one single atomic idea. And whenever he wrote a new card, he would undergo this grueling process... let's say he has a card on the concept of trust and it's numbered one. He writes a new thought that branches off from that, so he manually numbers it 1A... Then another thought branches off 1A, so it becomes 1A1. If a thought connects to both 1A1 and an entirely different card over in section 52, he physically writes down the cross-references on both cards.”
Created: 8/13/2026, 9:52:16 AM
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