Divide three by zero. A modern calculator returns an error; Bhāskara II's Bījagaṇita (1150 CE) returns an answer: khahara, "termed an infinite quantity." He writes that this quantity is unaltered when anything finite is added to it or taken away — and compares it to the changeless deity in whom worlds are absorbed and re-created. Europe had no working symbol for infinity until Wallis introduced ∞ in 1655.