Research area co-occurrence refers to the occurrence and overlap of different research areas within a particular field of study or discipline. This can occur when multiple research areas share common themes, concepts, methods, or goals, leading researchers to collaborate and work together across disciplinary boundaries. Co-occurrence analysis can help identify emerging trends, interdisciplinary connections, and areas of potential collaboration within the research landscape. By understanding how different research areas co-occur, researchers can gain insights into the overall structure and dynamics of a particular field, as well as opportunities for cross-fertilization and knowledge exchange.