{"type":"standard","title":"Arithmetical hierarchy","displaytitle":"Arithmetical hierarchy","namespace":{"id":0,"text":""},"wikibase_item":"Q669094","titles":{"canonical":"Arithmetical_hierarchy","normalized":"Arithmetical hierarchy","display":"Arithmetical hierarchy"},"pageid":186475,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Arithmetic_hierarchy.svg/330px-Arithmetic_hierarchy.svg.png","width":320,"height":544},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/thumb/5/53/Arithmetic_hierarchy.svg/335px-Arithmetic_hierarchy.svg.png","width":335,"height":569},"lang":"en","dir":"ltr","revision":"1283305178","tid":"479f1d47-0e58-11f0-a44f-8397c3f29709","timestamp":"2025-03-31T17:47:57Z","description":"Hierarchy of complexity classes for formulas defining sets","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Arithmetical_hierarchy","revisions":"https://en.wikipedia.org/wiki/Arithmetical_hierarchy?action=history","edit":"https://en.wikipedia.org/wiki/Arithmetical_hierarchy?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Arithmetical_hierarchy"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Arithmetical_hierarchy","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Arithmetical_hierarchy","edit":"https://en.m.wikipedia.org/wiki/Arithmetical_hierarchy?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Arithmetical_hierarchy"}},"extract":"In mathematical logic, the arithmetical hierarchy, arithmetic hierarchy or Kleene–Mostowski hierarchy classifies certain sets based on the complexity of formulas that define them. Any set that receives a classification is called arithmetical. The arithmetical hierarchy was invented independently by Kleene (1943) and Mostowski (1946).","extract_html":"
In mathematical logic, the arithmetical hierarchy, arithmetic hierarchy or Kleene–Mostowski hierarchy classifies certain sets based on the complexity of formulas that define them. Any set that receives a classification is called arithmetical. The arithmetical hierarchy was invented independently by Kleene (1943) and Mostowski (1946).
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{"fact":"Retractable claws are a physical phenomenon that sets cats apart from the rest of the animal kingdom. I n the cat family, only cheetahs cannot retract their claws.","length":163}
{"type":"standard","title":"Leopold Seyffert","displaytitle":"Leopold Seyffert","namespace":{"id":0,"text":""},"wikibase_item":"Q6527056","titles":{"canonical":"Leopold_Seyffert","normalized":"Leopold Seyffert","display":"Leopold Seyffert"},"pageid":25854908,"thumbnail":{"source":"https://upload.wikimedia.org/wikipedia/commons/d/d4/Lgs_small.jpg","width":225,"height":318},"originalimage":{"source":"https://upload.wikimedia.org/wikipedia/commons/d/d4/Lgs_small.jpg","width":225,"height":318},"lang":"en","dir":"ltr","revision":"1279208041","tid":"e8c1cca6-fb0b-11ef-823c-867a0d7bc9d7","timestamp":"2025-03-07T04:23:24Z","description":"American painter (1887–1956)","description_source":"local","content_urls":{"desktop":{"page":"https://en.wikipedia.org/wiki/Leopold_Seyffert","revisions":"https://en.wikipedia.org/wiki/Leopold_Seyffert?action=history","edit":"https://en.wikipedia.org/wiki/Leopold_Seyffert?action=edit","talk":"https://en.wikipedia.org/wiki/Talk:Leopold_Seyffert"},"mobile":{"page":"https://en.m.wikipedia.org/wiki/Leopold_Seyffert","revisions":"https://en.m.wikipedia.org/wiki/Special:History/Leopold_Seyffert","edit":"https://en.m.wikipedia.org/wiki/Leopold_Seyffert?action=edit","talk":"https://en.m.wikipedia.org/wiki/Talk:Leopold_Seyffert"}},"extract":"Leopold Gould Seyffert was an American painter. Born in California, Missouri, and raised in Colorado and then Pittsburgh, his career brought him eventually to New York City, via Philadelphia and Chicago. In New York City, the dealer Macbeth established him as one of the leading portraitists of the 20th century and his over 500 portraits continue to decorate the galleries, rooms and halls of many of America's museums and institutions.","extract_html":"
Leopold Gould Seyffert was an American painter. Born in California, Missouri, and raised in Colorado and then Pittsburgh, his career brought him eventually to New York City, via Philadelphia and Chicago. In New York City, the dealer Macbeth established him as one of the leading portraitists of the 20th century and his over 500 portraits continue to decorate the galleries, rooms and halls of many of America's museums and institutions.
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