Question: what are thetheorem which start with the letter t
Paraphrase: What theories start with "t"?
SPARQL (Wikidata): SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q65943 . ?sbj rdfs:label ?sbj_label . FILTER(STRSTARTS(lcase(?sbj_label), 't')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
Answer: Tietze extension theorem, Tietze extension theorem, Tychonoff's theorem, Tychonoff's theorem, Taylor's theorem, Taylor's theorem, Thales' theorem, Thales' theorem, transversality theorem, transversality theorem, triangle inequality, triangle inequality, Teichmüller–Tukey lemma, Teichmüller–Tukey lemma, Thévenin's theorem, Thévenin's theorem, tennis racket theorem, tennis racket theorem, Theorema Egregium, Theorema Egregium, Turán's theorem, Turán's theorem, Toda's theorem, Toda's theorem, Tarski's undefinability theorem, Tarski's undefinability theorem, Tutte theorem, Tutte theorem, Tijdeman's theorem, Tijdeman's theorem, Torricelli's law, Torricelli's law, the inscribed angle theorem, the inscribed angle theorem, Thue–Siegel–Roth theorem, Thue–Siegel–Roth theorem, Theorem on friends and strangers, Theorem on friends and strangers, theorem of the highest weight, theorem of the highest weight, theorem about nine points on cubic curve, theorem about nine points on cubic curve, Tait–Kneser theorem, Tait–Kneser theorem, Teichmüller's Theorem, Teichmüller's Theorem, Thales' theorems, Thales' theorems, Tennenbaum's theorem, Tennenbaum's theorem