🌐EnglishEnglishDeutschEspañolFrançaisItalianoPolskiPortuguêsРусский한국어中文日本語EntityQ1149458· pop 17· linked from 352 articlescompactness theoremtheoremAvailable in 17 languagesEspañolFrançaisDeutsch中文日本語РусскийPortuguêsItalianoCzechEsperantoConnectionsfirst-order logicEntitystructureEntityCategoriesMathematical logicMetatheoremsModel theoryTheorems in the foundations of mathematics