Corrado Böhm. Corrado Böhm Technology Programming Logics λ 25 January / 25

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1 Corrado Böhm Corrado Böhm Technology Programming Logics λ 25 January / 25

2 Technology 1951: Corrado Böhm Technology Programming Logics λ 25 January / 25

3 Technology 1951: Corrado Böhm Technology Programming Logics λ 25 January / 25

4 Technology 1951: a compiler that can compile the language in which it is written Corrado Böhm Technology Programming Logics λ 25 January / 25

5 Technology 1951: a compiler that can compile the language in which it is written a meta-circular compiler Corrado Böhm Technology Programming Logics λ 25 January / 25

6 Technology 1951: a compiler that can compile the language in which it is written a meta-circular compiler five years before FORTRAN was defined Corrado Böhm Technology Programming Logics λ 25 January / 25

7 Technology 1951: a compiler that can compile the language in which it is written a meta-circular compiler five years before FORTRAN was defined seven years before LISP was defined Corrado Böhm Technology Programming Logics λ 25 January / 25

8 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

9 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

10 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

11 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

12 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

13 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

14 Technology Corrado Böhm Technology Programming Logics λ 25 January / 25

15 Programming 1966: Corrado Böhm Technology Programming Logics λ 25 January / 25

16 Programming 1966: Böhm-Jacopini theorem Corrado Böhm Technology Programming Logics λ 25 January / 25

17 Programming 1966: Böhm-Jacopini theorem the theoretical basis of structured programming Corrado Böhm Technology Programming Logics λ 25 January / 25

18 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

19 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

20 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

21 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

22 Programming Corrado Bo hm Technology Programming Logics λ 25 January / 25

23 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

24 Programming Corrado Böhm Technology Programming Logics λ 25 January / 25

25 Logics 1968: Corrado Böhm Technology Programming Logics λ 25 January / 25

26 Logics 1968: Böhm s theorem Corrado Böhm Technology Programming Logics λ 25 January / 25

27 Logics 1968: Böhm s theorem equivalence of programs represented by λ-terms in β-η-normal form is decidable Corrado Böhm Technology Programming Logics λ 25 January / 25

28 Logics 1968: Böhm s theorem equivalence of programs represented by λ-terms in β-η-normal form is decidable two syntactically different β-η-normal forms can be separated by applying them to the same sequence of λ-terms Corrado Böhm Technology Programming Logics λ 25 January / 25

29 Logics 1968: Böhm s theorem equivalence of programs represented by λ-terms in β-η-normal form is decidable two syntactically different β-η-normal forms can be separated by applying them to the same sequence of λ-terms two terms of λ-calculus having syntactically different normal forms with respect to β-η-reduction cannot be consistently equated Corrado Böhm Technology Programming Logics λ 25 January / 25

30 Logics Corrado Bo hm Technology Programming Logics λ 25 January / 25

31 Logics Corrado Böhm Technology Programming Logics λ 25 January / 25

32 Logics Corrado Böhm Technology Programming Logics λ 25 January / 25

33 Logics Corrado Böhm Technology Programming Logics λ 25 January / 25

34 Logics Böhm-out technique SELECT(k, i) 1 i k = i ROTATE(k) 1 k a = a 1 k Corrado Böhm Technology Programming Logics λ 25 January / 25

35 Logics Böhm-out technique a a b 1 e c a a b e d Corrado Böhm Technology Programming Logics λ 25 January / 25

36 Logics Böhm-out technique a a b 1 e c a a b e d Corrado Böhm Technology Programming Logics λ 25 January / 25

37 Logics Böhm-out technique a a b 1 e c a a b e d a ROTATE(3) Corrado Böhm Technology Programming Logics λ 25 January / 25

38 Logics Böhm-out technique b e c b e d Corrado Böhm Technology Programming Logics λ 25 January / 25

39 Logics Böhm-out technique b e c b e d b SELECT(3, 2) Corrado Böhm Technology Programming Logics λ 25 January / 25

40 Logics Böhm-out technique c e d e Corrado Böhm Technology Programming Logics λ 25 January / 25

41 Logics Böhm-out technique c e d e e SELECT(3, 1) Corrado Böhm Technology Programming Logics λ 25 January / 25

42 Logics Böhm-out technique c d Corrado Böhm Technology Programming Logics λ 25 January / 25

43 Logics Böhm s theorem is constructive Corrado Böhm Technology Programming Logics λ 25 January / 25

44 Corrado Böhm with Combinators Corrado Böhm Technology Programming Logics λ 25 January / 25

45 Corrado Böhm with Combinators Corrado Böhm Technology Programming Logics λ 25courtesy Januaryof 2013 Carol Hindley 25 / 25

46 Corrado Böhm with Combinators Corrado Böhm Technology Programming Logics λ 25courtesy Januaryof 2013 Carol Hindley 25 / 25

47 Corrado Böhm with Combinators Corrado Böhm Technology Programming Logics λ 25courtesy Januaryof 2013 Carol Hindley 25 / 25

48 Corrado Bo hm with Combinators courtesy of Carol Hindley Corrado Bo hm Technology Programming Logics λ 25 January / 25

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