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What (who) is 2-EXPTIME - definition
2-EXPTIME
COMPLEXITY CLASS
2-EXP; 2EXPTIME
In computational complexity theory, the complexity class 2-EXPTIME (sometimes called 2-EXP) is the set of all decision problems solvable by a deterministic Turing machine in O(22p(n)) time, where p(n) is a polynomial function of n.
2-2-2-2
![Greater Britain]]''](https://commons.wikimedia.org/wiki/Special:FilePath/LNWR engine No.2053 'Greater Britain'.jpg?width=200 "Greater Britain]]''")
![LNWR ''John Hick'' Class, engine <br> No. 1535 ''[[Henry Maudslay]]''](https://commons.wikimedia.org/wiki/Special:FilePath/LNWR engine No. 1535 Henry Maudslay.jpg?width=200 "LNWR ''John Hick'' Class, engine <br> No. 1535 ''[[Henry Maudslay]]''")
LOCOMOTIVE WHEEL ARRANGEMENT
2-(2-2)-2; 2-2-2-2T
Under the Whyte notation for the classification of steam locomotives, 2-2-2-2 could represent either the wheel arrangement of two leading wheels, four powered but uncoupled driving wheels, and two trailing wheels; or of two independent leading axles (not in a bogie truck), two driving wheels, and two trailing wheels.
2-2-2-0
LOCOMOTIVE WHEEL ARRANGEMENT
2-(2-2)-0
Under the Whyte notation for the classification of steam locomotives, 2-2-2-0 usually represents the wheel arrangement of two leading wheels on one axle, four powered but uncoupled driving wheels on two axles, and no trailing wheels, but can also be used to represent two sets of leading wheels (not in a bogie truck) two driving wheels, and no trailing wheels. Some authorities place brackets around the duplicated but uncoupled wheels, creating a notation 2-(2-2)-0, or (2-2)-2-0,Baxter, pp.
