Understanding Post-Co-ordinate Indexing

Post-co-ordinate indexing is a method used in information retrieval and library science. In this approach, individual concepts or terms (often called 'uniterms') are indexed separately. The combination of these terms happens during the search process, not when the documents are originally indexed. This allows for flexible searching by combining different terms using Boolean operators (like AND, OR, NOT).

Identifying Contributors to Post-Co-ordinate Indexing

The question asks to identify the names associated with the development or significant work in post-co-ordinate indexing. Let's look at the individuals mentioned:

• A. Mortimer Taube: Mortimer Taube is widely recognized as a pioneer in the field of coordinate indexing. He developed the "Uniterm" system in the early 1950s, which is a classic example of post-co-ordinate indexing. His work laid the foundation for many subsequent developments in automated information retrieval.
• B. Eugene Garfield: Dr. Eugene Garfield is renowned for his work in bibliometrics and creating the Science Citation Index (SCI). While a major figure in information science, his primary contributions are related to citation indexing and analysis, rather than the fundamental development of post-co-ordinate indexing systems like Uniterm.
• C. Calvin Mooers: Calvin Mooers was another important figure in the early days of information retrieval. He worked on concepts related to coordinate indexing and search strategies. He developed systems like "Zatocoding," which utilized principles aligned with post-co-ordinate indexing, focusing on efficient retrieval based on combinations of terms.
• D. W.E. Batten: W.E. Batten was involved in the application and development of early information retrieval systems, including work related to the Uniterm system and other coordinate indexing approaches. His contributions support the practical implementation and understanding of these methods.
• E. Jorge E. Hirsch: Jorge E. Hirsch is known for developing the h-index, a metric used to measure a researcher's scientific output and citation impact. This is unrelated to the principles or systems of post-co-ordinate indexing.

Conclusion on Contributors

Based on their contributions to the theory and practice of indexing systems, particularly those involving the coordination of terms at search time:

• Mortimer Taube (Uniterm system)
• Calvin Mooers (Zatocoding, search strategies)
• W.E. Batten (Application of coordinate indexing)

are the names most directly associated with post-co-ordinate indexing.

Therefore, the correct option includes A, C, and D.