H. P. Luhn

1896 – 1964

• A serial notation for describing the topology of multidimensional branced structures
• A statistical approach to mechanized encoding and searching of literary information
• Auto-encoding of documents for information retrieval systems
• Information retrieval through row-by row scanning on the IBM 101 Electronic Statistical Machine (row-by-row scanning attachment)
• Keyword-in-context index for technical literature (KWIC index)
• Row-by-row scanning systems for IBM punched cards as applied to information retrieval problems
• Selective dissemination of new scientific information with the aid of electronic processing equipment
• Self-demarcating code words
• Superimposed coding with the aid of randomizing squares for use in mechanical informaiton searching systems
• The automatic creation of literature abstracts (auto-abstracts)
• The automatic derivation of information retrieval encodements from machine-readable texts
• The IBM electronic information searching system