In Slavic mythology[?]Crnobog (pr. Tser-nah-bog, to rhyme with There-are-not, in its Balkan[?] spelling) was the god of evil and darkness, in opposition to Bielbog[?]. His name means "The Black God" (Balkan Crno "black" and Bog "god", existing the word bog in many Slaviclanguages). Other spellings: Chernobog (in Latin characters, transliterated from Cyrillic).
... {b^2-4ac}}{2a}
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The term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively ...