In computability theory, the Church–Turing thesis (also known as computability thesis, the Turing–Church thesis, the Church–Turing conjecture, Church's thesis, Church's conjecture, and Turing's thesis) is a thesis about the nature of computable functions.It states that a function on the natural numbers can be calculated by an effective method if and only if it is computable by …

Religion. Church (building), a building for Christian religious activities Church (congregation), a local congregation of a Christian denomination Church service, a formalized period of Christian communal worship; Christian denomination, a Christian organization with distinct doctrine and practice; Christian Church, either the collective body of all Christian believers, or early Christianity