[pvs] few old files
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socrates: THEORY
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BEGIN
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man: TYPE
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socrates: man
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x: VAR man
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mortal(x): boolean
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menMortal: AXIOM
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forall x: mortal(x)
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socratesMortal: LEMMA
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mortal(socrates)
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END socrates
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sumn: THEORY
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BEGIN
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n: VAR nat
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sum(n): RECURSIVE nat =
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(IF n = 0 THEN
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0
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ELSE
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n + sum(n-1)
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ENDIF)
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MEASURE (λ n: n)
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nnatsum: THEOREM
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sum(n) = (n * (n+1)) / 2
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END sumn
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sum: THEORY
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BEGIN
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n: VAR nat
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f, g: VAR [nat -> nat]
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sum(f, n): RECURSIVE nat =
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IF n = 0
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THEN 0
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ELSE f(n-1) + sum(f, n - 1)
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ENDIF
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MEASURE n
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sum_plus: LEMMA
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sum((lambda n: f(n) + g(n)), n) = sum(f, n) + sum(g, n)
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square(n): nat = n*n
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sum_of_squares: LEMMA
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6 * sum(square, n+1) = n * (n + 1) * (2*n + 1)
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cube(n): nat = n*n*n
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sum_of_cubes: LEMMA
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4 * sum(cube, n+1) = n*n*(n+1)*(n+1)
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END sum
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sumtut: THEORY
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BEGIN
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n: VAR nat
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sum(n): RECURSIVE nat =
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(IF n = 0 THEN 0 ELSE n + sum(n-1) ENDIF)
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MEASURE (LAMBDA n:n)
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closed_form: THEOREM sum(n) = n * (n + 1)/2
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END sumtut
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