Certification Problem

Input (TPDB SRS_Standard/Zantema_04/z005)

The rewrite relation of the following TRS is considered.

Property / Task

Answer / Result

Proof (by matchbox @ termCOMP 2023)

1 String Reversal

1.1 Dependency Pair Transformation

1.1.1 Dependency Graph Processor

The dependency pairs are split into 1 component.

• The 1^st component contains the pair

  a#(a(x1))	→	b#(a(x1))	(11)
  b#(c(a(x1)))	→	b#(x1)	(7)
  b#(c(a(x1)))	→	b#(a(b(x1)))	(8)
  b#(c(a(x1)))	→	a#(b(x1))	(9)
  b#(c(a(x1)))	→	a#(b(a(b(x1))))	(10)

  1.1.1.1 Reduction Pair Processor with Usable Rules

  Using the matrix interpretations of dimension 2 with strict dimension 1 over the arctic semiring over the naturals

  [c(x1)]	=	0 0 0 0 · x1 + -∞ -∞
  [b(x1)]	=	0 0 0 0 · x1 + -∞ -∞
  [a(x1)]	=	0 0 -2 -2 · x1 + -∞ -∞
  [b#(x1)]	=	1 2 1 2 · x1 + -∞ -∞
  [a#(x1)]	=	1 1 1 1 · x1 + -∞ -∞

  together with the usable rules

  b(c(a(x1)))	→	a(b(a(b(x1))))	(4)
  b(x1)	→	c(a(c(x1)))	(2)
  a(a(x1))	→	a(c(b(a(x1))))	(5)

  (w.r.t. the implicit argument filter of the reduction pair), the pairs

  b#(c(a(x1)))	→	b#(a(b(x1)))	(8)
  b#(c(a(x1)))	→	a#(b(x1))	(9)
  b#(c(a(x1)))	→	a#(b(a(b(x1))))	(10)

  could be deleted.

  1.1.1.1.1 Monotonic Reduction Pair Processor with Usable Rules

  Using the matrix interpretations of dimension 1 with strict dimension 1 over the rationals with delta = 1

  [c(x1)]	=	x1 + 0
  [b(x1)]	=	x1 + 0
  [a(x1)]	=	x1 + 0
  [b#(x1)]	=	x1 + 0
  [a#(x1)]	=	x1 + 1

  together with the usable rules

  b(c(a(x1)))	→	a(b(a(b(x1))))	(4)
  b(x1)	→	c(a(c(x1)))	(2)
  a(a(x1))	→	a(c(b(a(x1))))	(5)

  (w.r.t. the implicit argument filter of the reduction pair), the pair

  a#(a(x1))

  →

  b#(a(x1))

  (11)

  and no rules could be deleted.

  1.1.1.1.1.1 Dependency Graph Processor

  The dependency pairs are split into 1 component.

  • The 1^st component contains the pair

    b#(c(a(x1)))

    →

    b#(x1)

    (7)

    1.1.1.1.1.1.1 Monotonic Reduction Pair Processor with Usable Rules

    Using the matrix interpretations of dimension 1 with strict dimension 1 over the rationals with delta = 1

    [c(x1)]	=	x1 + 1
    [a(x1)]	=	x1 + 1
    [b#(x1)]	=	x1 + 0

    having no usable rules (w.r.t. the implicit argument filter of the reduction pair), the pair

    b#(c(a(x1)))

    →

    b#(x1)

    (7)

    and no rules could be deleted.

    1.1.1.1.1.1.1.1 Dependency Graph Processor

    The dependency pairs are split into 0 components.