ɪn mˌæθɪmˈæɾɪks, ðə lˈaɪ ˈældʒᵻbɹə ˈiː sˈɛvən ɐ hˈæf ɪz ɐ sˈʌbɐldʒˌɛbɹə ʌv ˈiː ˈeɪt kəntˈeɪnɪŋ ˈiː sˈɛvən dᵻfˈaɪnd baɪ lˈændsbɜːɡ ænd mˈænɪvəl ɪn ˈɔːɹdɚ
In mathematics, the Lie algebra E7½ is a subalgebra of E8 containing E7 defined by Landsberg and  Manivel in order