WORST_CASE(?,O(n^2)) * Step 1: NaturalPI WORST_CASE(?,O(n^2)) + Considered Problem: - Strict TRS: *(@x,@y) -> #mult(@x,@y) dyade(@l1,@l2) -> dyade#1(@l1,@l2) dyade#1(::(@x,@xs),@l2) -> ::(mult(@x,@l2),dyade(@xs,@l2)) dyade#1(nil(),@l2) -> nil() mult(@n,@l) -> mult#1(@l,@n) mult#1(::(@x,@xs),@n) -> ::(*(@n,@x),mult(@n,@xs)) mult#1(nil(),@n) -> nil() - Weak TRS: #add(#0(),@y) -> @y #add(#neg(#s(#0())),@y) -> #pred(@y) #add(#neg(#s(#s(@x))),@y) -> #pred(#add(#pos(#s(@x)),@y)) #add(#pos(#s(#0())),@y) -> #succ(@y) #add(#pos(#s(#s(@x))),@y) -> #succ(#add(#pos(#s(@x)),@y)) #mult(#0(),#0()) -> #0() #mult(#0(),#neg(@y)) -> #0() #mult(#0(),#pos(@y)) -> #0() #mult(#neg(@x),#0()) -> #0() #mult(#neg(@x),#neg(@y)) -> #pos(#natmult(@x,@y)) #mult(#neg(@x),#pos(@y)) -> #neg(#natmult(@x,@y)) #mult(#pos(@x),#0()) -> #0() #mult(#pos(@x),#neg(@y)) -> #neg(#natmult(@x,@y)) #mult(#pos(@x),#pos(@y)) -> #pos(#natmult(@x,@y)) #natmult(#0(),@y) -> #0() #natmult(#s(@x),@y) -> #add(#pos(@y),#natmult(@x,@y)) #pred(#0()) -> #neg(#s(#0())) #pred(#neg(#s(@x))) -> #neg(#s(#s(@x))) #pred(#pos(#s(#0()))) -> #0() #pred(#pos(#s(#s(@x)))) -> #pos(#s(@x)) #succ(#0()) -> #pos(#s(#0())) #succ(#neg(#s(#0()))) -> #0() #succ(#neg(#s(#s(@x)))) -> #neg(#s(@x)) #succ(#pos(#s(@x))) -> #pos(#s(#s(@x))) - Signature: {#add/2,#mult/2,#natmult/2,#pred/1,#succ/1,*/2,dyade/2,dyade#1/2,mult/2,mult#1/2} / {#0/0,#neg/1,#pos/1,#s/1 ,::/2,nil/0} - Obligation: innermost runtime complexity wrt. defined symbols {#add,#mult,#natmult,#pred,#succ,*,dyade,dyade#1,mult ,mult#1} and constructors {#0,#neg,#pos,#s,::,nil} + Applied Processor: NaturalPI {shape = Mixed 2, restrict = NoRestrict, uargs = UArgs, urules = URules, selector = Nothing} + Details: We apply a polynomial interpretation of kind constructor-based(mixed(2)): The following argument positions are considered usable: uargs(#add) = {2}, uargs(#neg) = {1}, uargs(#pos) = {1}, uargs(#pred) = {1}, uargs(#succ) = {1}, uargs(::) = {1,2} Following symbols are considered usable: {#add,#mult,#natmult,#pred,#succ,*,dyade,dyade#1,mult,mult#1} TcT has computed the following interpretation: p(#0) = 0 p(#add) = x2 p(#mult) = x1*x2 p(#natmult) = 0 p(#neg) = x1 p(#pos) = x1 p(#pred) = x1 p(#s) = 0 p(#succ) = x1 p(*) = 1 + x1 + 2*x1*x2 p(::) = 2 + x1 + x2 p(dyade) = 1 + 3*x1 + 3*x1*x2 p(dyade#1) = 3*x1 + 3*x1*x2 p(mult) = 1 + 2*x1*x2 + 3*x2 p(mult#1) = 3*x1 + 2*x1*x2 p(nil) = 2 Following rules are strictly oriented: *(@x,@y) = 1 + @x + 2*@x*@y > @x*@y = #mult(@x,@y) dyade(@l1,@l2) = 1 + 3*@l1 + 3*@l1*@l2 > 3*@l1 + 3*@l1*@l2 = dyade#1(@l1,@l2) dyade#1(::(@x,@xs),@l2) = 6 + 6*@l2 + 3*@l2*@x + 3*@l2*@xs + 3*@x + 3*@xs > 4 + 3*@l2 + 2*@l2*@x + 3*@l2*@xs + 3*@xs = ::(mult(@x,@l2),dyade(@xs,@l2)) dyade#1(nil(),@l2) = 6 + 6*@l2 > 2 = nil() mult(@n,@l) = 1 + 3*@l + 2*@l*@n > 3*@l + 2*@l*@n = mult#1(@l,@n) mult#1(::(@x,@xs),@n) = 6 + 4*@n + 2*@n*@x + 2*@n*@xs + 3*@x + 3*@xs > 4 + @n + 2*@n*@x + 2*@n*@xs + 3*@xs = ::(*(@n,@x),mult(@n,@xs)) mult#1(nil(),@n) = 6 + 4*@n > 2 = nil() Following rules are (at-least) weakly oriented: #add(#0(),@y) = @y >= @y = @y #add(#neg(#s(#0())),@y) = @y >= @y = #pred(@y) #add(#neg(#s(#s(@x))),@y) = @y >= @y = #pred(#add(#pos(#s(@x)),@y)) #add(#pos(#s(#0())),@y) = @y >= @y = #succ(@y) #add(#pos(#s(#s(@x))),@y) = @y >= @y = #succ(#add(#pos(#s(@x)),@y)) #mult(#0(),#0()) = 0 >= 0 = #0() #mult(#0(),#neg(@y)) = 0 >= 0 = #0() #mult(#0(),#pos(@y)) = 0 >= 0 = #0() #mult(#neg(@x),#0()) = 0 >= 0 = #0() #mult(#neg(@x),#neg(@y)) = @x*@y >= 0 = #pos(#natmult(@x,@y)) #mult(#neg(@x),#pos(@y)) = @x*@y >= 0 = #neg(#natmult(@x,@y)) #mult(#pos(@x),#0()) = 0 >= 0 = #0() #mult(#pos(@x),#neg(@y)) = @x*@y >= 0 = #neg(#natmult(@x,@y)) #mult(#pos(@x),#pos(@y)) = @x*@y >= 0 = #pos(#natmult(@x,@y)) #natmult(#0(),@y) = 0 >= 0 = #0() #natmult(#s(@x),@y) = 0 >= 0 = #add(#pos(@y),#natmult(@x,@y)) #pred(#0()) = 0 >= 0 = #neg(#s(#0())) #pred(#neg(#s(@x))) = 0 >= 0 = #neg(#s(#s(@x))) #pred(#pos(#s(#0()))) = 0 >= 0 = #0() #pred(#pos(#s(#s(@x)))) = 0 >= 0 = #pos(#s(@x)) #succ(#0()) = 0 >= 0 = #pos(#s(#0())) #succ(#neg(#s(#0()))) = 0 >= 0 = #0() #succ(#neg(#s(#s(@x)))) = 0 >= 0 = #neg(#s(@x)) #succ(#pos(#s(@x))) = 0 >= 0 = #pos(#s(#s(@x))) WORST_CASE(?,O(n^2))