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For questions on the formal system in mathematical logic for expressing effective functions, programs and computation, and proofs, using abstract notions of functions and combining them through binding and substitution.
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Why is there no product type in simply typed lambda-calculus?
$\DeclareMathOperator\Pair{Pair}\DeclareMathOperator\First{First}\DeclareMathOperator\Second{Second}\DeclareMathOperator\Left{Left}\DeclareMathOperator\Right{Right}\DeclareMathOperator\Choice{Choice}$ …