Church–Turing thesis

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Church–Turing thesis(Q309157) is a conjecture in computer science.

Excerpts from Wikipedia

On the other hand, the Church–Turing thesis states that the above three formally-defined classes of computable functions coincide with the informal notion of an effectively calculable function. Although the thesis has near-universal acceptance, it cannot be formally proven, as the concept of effective calculability is only informally defined.