tuatara

Definitions

  • WordNet 3.6
    • n tuatara only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
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Webster's Revised Unabridged Dictionary
  • Interesting fact: The tuatara lizard of New Zealand has three eyes, two in the center of its head and one on the top of its head
    • n Tuatara (Zoöl) A large iguanalike reptile (Sphenodon punctatum) formerly common in New Zealand, but by 1900 confined to certain islets near the coast. It reaches a length of two and a half feet, is dark olive-green with small white or yellowish specks on the sides, and has yellow spines along the back, except on the neck. It is the only surviving member of the order Rhyncocephala. Also called tuatera and hatteria.
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Etymology

Webster's Revised Unabridged Dictionary
Maori tuatàra,; tua, on the farther side (the back) + tara, spine

Usage


In news:

SSC sending out Ultimate Aero with Tuatara -powered XT.
The tuatara , a New Zealand reptile, slides its lower jaw back and forth.
Tuatara / The Minus 5.
Kevin Cole is joined by Northwest music heavyweights Scott McCaughey, Peter Buck, Barrett Martin, and Dave Carter for an exclusive KEXP live performance featuring both Tuatara and The Minus 5 tracks.
Scott McCaughey from Young Fresh Fellows, Peter Buck from REM and Barrett Martin from The Screaming Trees not only perform together in Seattle group Tuatara , they also have a rock band called Minus 5.
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In science:

We prove the existence of universal convergent and tuatara machines.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
For example, we show that the zeta number of a universal tuatara machine is c.e. and random. A new type of partial randomness, asymptotic randomness, is introduced.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Every self-delimiting Turing machine is tuatara, but the converse is not true.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Also, there exist universal convergent and tuatara machines; there is a tuatara machine universal for the class of convergent machines.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Every self-delimiting Turing machine is a tuatara machine.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Tuatara has not changed its form much in over 225 million years! Its relatives died out about 60 million years ago.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
We have seen that every self-delimiting Turing machine is a tuatara machine (Proposition 9), but the converse is not true (Fact 15, b)).
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
For each self-delimiting Turing machine C there effectively exists a tuatara machine V such that ζV = ΩC .
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Actually, we can describe a more precise simulation of a self-delimiting Turing machine with a tuatara machine.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Given a self-delimiting Turing machine C we can effectively construct a tuatara machine V such that ζV = ΩC .
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
We define the domain of the tuatara machine V to be dom(V ) = [p∈dom(C ) where X (p) is the set {p} ∪ {p0i |pi = 1} and pi is the ith bit of p, numbering from the left and starting with i = 1.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Given a universal self-delimiting Turing machine U we can effectively construct a tuatara machine W universal for al l self-delimiting Turing machines such that ζW = ΩU .
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Next we turn our attention to universal convergent/tuatara machines.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
The sets of convergent machines and tuatara machines are c.e.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
Let (Ci )i≥1 be an enumeration of tuatara machines.
Natural Halting Probabilities, Partial Randomness, and Zeta Functions
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