What are the parabolic differential equation which start with the letter equation
SELECT DISTINCT ?sbj ?sbj_label WHERE { ?sbj wdt:P31 wd:Q1575416 . ?sbj rdfs:label ?sbj_label . FILTER(CONTAINS(lcase(?sbj_label), 'equation')) . FILTER (lang(?sbj_label) = 'en') } LIMIT 25 
parabolic partial differential equation: Q1575416