Certification Problem

Input (TPDB SRS_Standard/Waldmann_07_size12/size-12-alpha-3-num-417)

The rewrite relation of the following TRS is considered.

Property / Task

Answer / Result

Proof (by AProVE @ termCOMP 2023)

1 Dependency Pair Transformation

1.1 Dependency Graph Processor

The dependency pairs are split into 1 component.

• The 1^st component contains the pair

  b#(b(c(x1)))	→	b#(c(a(b(x1))))	(6)
  b#(b(c(x1)))	→	a#(b(x1))	(8)
  a#(x1)	→	b#(x1)	(4)
  b#(b(c(x1)))	→	b#(x1)	(9)

  1.1.1 Reduction Pair Processor

  Using the matrix interpretations of dimension 3 with strict dimension 1 over the arctic semiring over the naturals

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

  the pair

  b#(b(c(x1)))

  →

  b#(c(a(b(x1))))

  (6)

  could be deleted.

  1.1.1.1 Reduction Pair Processor

  Using the matrix interpretations of dimension 3 with strict dimension 1 over the arctic semiring over the naturals

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

  the pair

  a#(x1)

  →

  b#(x1)

  (4)

  could be deleted.

  1.1.1.1.1 Dependency Graph Processor

  The dependency pairs are split into 1 component.

  • The 1^st component contains the pair

    b#(b(c(x1)))

    →

    b#(x1)

    (9)

    1.1.1.1.1.1 Monotonic Reduction Pair Processor with Usable Rules

    Using the linear polynomial interpretation over the naturals

    [b(x1)]	=	1 · x1
    [c(x1)]	=	1 · x1
    [b#(x1)]	=	1 · x1

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

    1.1.1.1.1.1.1 Size-Change Termination

    Using size-change termination in combination with the subterm criterion one obtains the following initial size-change graphs.

    b#(b(c(x1)))	→	b#(x1)	(9)
    1	>	1

    As there is no critical graph in the transitive closure, there are no infinite chains.