The H-index, or Hirsch index, is a metric used to measure the productivity and impact of a researcher or scholar's published work. It was proposed by physicist Jorge E. Hirsch in 2005. The H-index combines both the quantity (number of publications) and quality (number of citations) of a researcher's work into a single number, providing a more comprehensive view of their academic influence than citations alone.
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PageRank was apparently inspired by it originally, given that.