ɪn mˌæθɪmˈæɾɪks, ɪnðɪ ˈɛɹiə ʌv pətˈɛnʃəl θˈiəɹi, ɐ lˈɛbɛsɡ spˈaɪn ɔːɹ lˈɛbɛsɡ θˈɔːɹn ɪz ɐ tˈaɪp ʌv sˈɛt jˈuːzd fɔːɹ dɪskˈʌsɪŋ səlˈuːʃənz tə ðə dˈɪɹɪtʃlɪt pɹˈɑːbləm ænd ɹᵻlˈeɪɾᵻd pɹˈɑːbləmz ʌv pətˈɛnʃəl θˈiəɹi.
In mathematics, in the area of potential theory, a Lebesgue spine or Lebesgue thorn is a type of set used for discussing solutions to the Dirichlet problem and related problems of potential theory.