Augustus De Morgan was an Indian-born British mathematician and logician; he was the first professor of mathematics at University College London. He formulated De Morgan's laws and was the first to introduce the term, and make rigorous the idea of mathematical induction. De Morgan crater on the Moon is named after him.

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• The moving power of mathematical invention is not reasoning, but imagination.
  • Quoted in Robert Perceval Graves The Life of Sir William Rowan Hamilton Vol. 3 (1889) p. 219.

• All existing things upon this earth, which have knowledge of their oen existence, possess, some in one degree and some in another, the power of thought, accompanied by perception, which is the awakening of thought by the effects of external objects upon the senses.
  • Formal Logic (1847)