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In terms of DSPACE,

The complexity class EXPSPACE-complete is also a set of decision problems. A decision problem is in EXPSPACE-complete if it is in EXPSPACE, and every problem in EXPSPACE has a polynomial-time many-one reduction to it. In other words, there is a polynomial-time algorithm that transforms instances of one to instances of the other with the same answer. EXPSPACE-complete might be thought of as the hardest problems in EXPSPACE.

EXPSPACE is a strict superset of PSPACE, NP-complete, NP, and P and is believed to be a strict superset of EXPTIME.

An example of an EXPSPACE-complete problem is the problem of recognizing whether two regular expressions represent different languages, where the expressions are limited to four operators: union, concatenation, the Kleene star (zero or more copies of an expression), and squaring (two copies of an expression).

If the Kleene star is left out, then that problem becomes NEXPTIME-complete, which is like EXPTIME-complete, except it is defined in terms of non-deterministic Turing machines rather than deterministic.

It has also been shown by L. Berman in 19801980 is a leap year starting on Tuesday. Events January-February January 1- April 1 National steel strike in United Kingdom January 1 Changes to the Swedish Act of Succession creates Victoria of Sweden, Crown Princess over her younger brother January 5 He that the problem of verifying / falsifying any first-order statement about real numberIn mathematics, the real numbers are intuitively defined as numbers that are in one-to-one correspondence with the points on an infinite line—the number line. The term "real number" is a retronym coined in response to " imaginary number". Real numbers mays that involves only additionAddition is one of the basic operations of arithmetic. In its simplest form, addition combines two numbers terms summands , the augend and addend into a single number, the sum . Adding more numbers corresponds to repeated addition. By extension, addition and comparison (but no multiplicationArithmetic In its simplest form, multiplication is a quick way of adding identical numbers. The result of multiplying numbers is called a product''. The numbers being multiplied are called coefficients or factors and individually as the multiplicand and m) is in EXPSPACE.

References

• L. Berman The complexity of logical theories, Theoretical Computer Science 11:71-78, 1980.