Modal operator

https://www.wikidata.org/wiki/Q638442

Field Hierarchy

Parent
Computer science 57M papers	Chemistry 29.5M papers	Materials science 19.1M papers	Artificial intelligence 11.8M papers
Composite material 9M papers	Programming language 7.4M papers	Polymer chemistry 1.1M papers	Theoretical computer science 646k papers
Modal 103k papers		Description logic 19k papers
Current
Modal operator 1,096 papers
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