Both the Ash'aris and Maturidis follow occasionalism, a philosophy which refutes the basis for causality, as David Hume did in Europe many centuries later, but also proves the existence and nature of the Islamic belief of the tawhid (oneness of God) through formal logic.
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The Maturidis and Ash'aris are the two principal schools of systematic theology that are recognized by Sunni Islam.
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This theology is popular where the Hanafi school of law is followed, particularly the lands of the former Ottoman and Mughal empires, viz. in Turkey, the Balkans, the Caucasus, the Levant, Afghanistan, Central Asia, Pakistan, Bangladesh, and India.