Nonlinearity of Davenport Schinzel Sequences And of Generalized Path Compression
Nonlinearity of Davenport Schinzel Sequences And of Generalized Path Compression
Sergiu Hart
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(Bl) B2is) = 1, for 5 > 0. (B2) B^is) = J + 1, for J > 0. (B3) B^{s) > 2^, with s 2's in the exponential tower, for j > 0; i. E. B, is) > A, is). Indeed, ^4(0) = 1, and ^4(5) = ^4(^-1) + 2*^^^"^^ + 1 > 2^*'^ '^^ for 5 > 1. (B4) Each function Bi^{s) is strictly increasing in j, for all ik >: 3, and each sequence {Bi^{s)}^s, \ is strictly increasing, for all 5^ > 1. To see this note first that B, {s) > 1 for all yt > 2 and s > 0. This implies, for Jt > 3 and 5 > 0, that B, {s+1) = B, {s) + B, -i(...2**(^)) > B, {s) + 1 . hence also Bi, {s) > s+ 1. Finally, we obtain fi, + i(5) > B, (s) + 1, k^l, s^l. (This is clear for yt = 1. For it > 1 we have 2**"'^'"^^ >2'^s, hence B, is) = B, ^, is-1) + 5, (2^-'(^-^)) ^ 1 + B, {s) . ) (B5) B, {s) > A, _i(. Y), for it > 4, ^ > 1. This is proven by double induction on k and s. (B5) holds for /: = 4 by (B3), and holds for j' = 1 since 5, (1)- 1 + 5, _i(2)>2 = A, _i(l). -20- For it > 4 and s > 1, assume (B5) to hold for all 4
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