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| In [[mathematics]], the '''Gauss class number problem''' ('''for imaginary quadratic fields'''), as usually understood, is to provide for each ''n'' ≥ 1 a complete list of [[imaginary quadratic field]]s with [[class number (number theory)|class number]] ''n''. It is named after the great mathematician [[Carl Friedrich Gauss]]. It can also be stated in terms of [[Discriminant of an algebraic number field|discriminant]]s. There are related questions for real quadratic fields and the behavior as
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| :<math>d \to -\infty</math>.
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| The difficulty is in effective computation of bounds: for a given discriminant, it is easy to compute the class number, and there are several ineffective lower bounds on class number (meaning that they involve a constant that is not computed), but effective bounds (and explicit proofs of completeness of lists) are harder. | |
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| ==Gauss's original conjectures==
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| The problems are posed in Gauss's [[Disquisitiones Arithmeticae]] of 1801 (Section V, Articles 303 and 304).<ref>[http://www.claymath.org/publications/Gauss_Dirichlet/stark.pdf The Gauss Class-Number Problems], by H. M. Stark</ref>
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| Gauss discusses imaginary quadratic fields in Article 303, stating the first two conjectures, and discusses real quadratic fields in Article 304, stating the third conjecture.
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| ;'''Gauss Conjecture''' ('''Class number tends to infinity'''): <math>h(d) \to \infty\text{ as }d\to -\infty.</math>
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| ;'''Gauss Class Number Problem''' ('''Low class number lists'''): For given low class number (such as 1, 2, and 3), Gauss gives lists of imaginary quadratic fields with the given class number and believes them to be complete.
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| ;'''Infinitely many real quadratic fields with class number one''': Gauss conjectures that there are infinitely many real quadratic fields with class number one.
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| The original Gauss class number problem for imaginary quadratic fields is significantly different and easier than the modern statement: he restricted to even discriminants, and allowed non-fundamental discriminants.
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| ==Status==
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| ;'''Gauss Conjecture''': Solved, Heilbronn, 1934.
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| ;'''Low class number lists''': Class number 1: solved, Baker (1966), Stark (1967), Heegner (1952).
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| :Class number 2: solved, Baker (1971), Stark (1971)<ref name=irelandrosen>{{citation | last1 = Ireland | first1 = K. |last2 = Rosen | first2 = M. | title = A Classical Introduction to Modern Number Theory | publisher = Springer-Verlag | year = 1993 | location = New York, New York | pages = 358–361 | isbn = 0-387-97329-X}}</ref>
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| :Class number 3: solved, 1985<ref name=irelandrosen/>
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| :Class numbers h up to 100: solved, Watkins 2004<ref name=watkins>{{citation | last1 = Watkins | first1 = M. | title = Class numbers of imaginary quadratic fields | series = Mathematics of Computation | volume = 73 | year = 2004 | pages = 907–938 | url=http://www.ams.org/mcom/2004-73-246/S0025-5718-03-01517-5/home.html}}</ref>
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| ;'''Infinitely many real quadratic fields with class number one''': Open.
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| ==Lists of discriminants of class number 1==
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| {{details|Heegner number}}
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| For imaginary quadratic number fields, the (fundamental) [[Imaginary_quadratic_field#Discriminant|discriminants]] of class number 1 are:
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| :<math>d=-3,-4,-7,-8,-11,-19,-43,-67,-163.\ </math>
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| The non-fundamental discriminants of class number 1 are:
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| :<math>d=-12,-16,-27,-28.\ </math>
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| Thus, the even discriminants of class number 1, fundamental and non-fundamental (Gauss's original question) are:
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| :<math>d=-4,-8,-12,-16,-28.\ </math>
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| ==Modern developments==
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| In 1934, [[Hans Heilbronn]] proved the Gauss Conjecture. Equivalently, for any given class number, there are only finitely many imaginary quadratic number fields with that class number.
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| Also in 1934, Heilbronn and [[Edward Linfoot]] showed that there were at most 10 imaginary quadratic number fields with class number 1 (the 9 known ones, and at most one further).
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| The result was ineffective (see [[effective results in number theory]]): it did not allow bounds on the size of the remaining field.
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| In later developments, the case ''n'' = 1 was first discussed by [[Kurt Heegner]], using [[modular form]]s and [[modular equation]]s to show that no further such field could exist. This work was not initially accepted; only with later work of [[Harold Stark]] and [[Bryan Birch]] was the position clarified, and Heegner's work understood. See [[Stark–Heegner theorem]], [[Heegner number]]. Practically simultaneously, [[Alan Baker (mathematician)|Alan Baker]] proved what we now know as [[Baker's theorem]] on [[linear forms in logarithms]] of [[algebraic number]]s, which resolved the problem by a completely different method. The case ''n'' = 2 was tackled shortly afterwards, at least in principle, as an application of Baker's work.
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| The complete list of imaginary quadratic fields with class number one is <math>\mathbf{Q}(\sqrt{k})</math> with ''k'' one of
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| :<math>-1, -2, -3, -7, -11, -19, -43, -67, -163.\ </math>
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| The general case awaited the discovery of [[Dorian Goldfeld]] that the class number problem could be connected to the [[L-function]]s of [[elliptic curve]]s. This reduced the question, in principle, of effective determination, to one about establishing the existence of a multiple zero of such an L-function. This could be done on the basis of the later [[Gross-Zagier theorem]]. So at that point one could specify a finite calculation, the result of which would be a complete list for a given class number. In fact in practice such lists that are ''probably'' complete can be made by relatively simple methods; what is at issue is certainty. The cases up to ''n'' = 100 have now (2004) been done: see Watkins (2004).
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| ==Real quadratic fields==
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| The contrasting case of ''real'' quadratic fields is very different, and much less is known. That is because what enters the analytic formula for the class number is not ''h'', the class number, on its own — but ''h'' log ''ε'', where ''ε'' is a [[fundamental unit (number theory)|fundamental unit]]. This extra factor is hard to control. It may well be the case that class number 1 for real quadratic fields occurs infinitely often.
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| The Cohen-Lenstra heuristics<ref>Cohen, ch. 5.10</ref> are a set of more precise conjectures about the structure of class groups of quadratic fields. For real fields they predict that about 75.446% will have class number 1, a result that agrees with computations.<ref>te Riele & Williams</ref>
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| ==See also==
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| *[[List of number fields with class number one]]
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| ==Notes==
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| {{Reflist}}
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| ==References==
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| * {{Citation
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| | last = Goldfeld
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| | first = Dorian
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| |date=July 1985
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| | title = Gauss' Class Number Problem For Imaginary Quadratic Fields
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| | journal = [[Bulletin of the American Mathematical Society]]
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| | volume = 13
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| | issue = 1
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| | pages = 23–37
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| | url = http://www.ams.org/bull/1985-13-01/S0273-0979-1985-15352-2/S0273-0979-1985-15352-2.pdf
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| | format = [[PDF]]
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| | doi = 10.1090/S0273-0979-1985-15352-2}}
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| *{{citation | last=Heegner | first=Kurt | authorlink=Kurt Heegner | doi=10.1007/BF01174749|mr=0053135 | title=Diophantische Analysis und Modulfunktionen | journal=[[Mathematische Zeitschrift]] | volume=56 | issue=3 | year=1952 | pages=227–253}}
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| * {{Citation
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| | last1 = te Riele
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| | first1 = Herman
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| | last2 = Williams
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| | first2 = Hugh
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| | year = 2003
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| | title = New Computations Concerning the Cohen-Lenstra Heuristics
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| | journal = Experimental Mathematics
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| | volume = 12
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| | issue = 1
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| | pages = 99–113
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| | url = http://www.emis.de/journals/EM/expmath/volumes/12/12.1/pp99_113.pdf
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| | format = [[PDF]]}}
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| *{{citation
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| | last1 = Cohen | first1 = Henri
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| | title = A Course in Computational Algebraic Number Theory
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| | publisher = [[Springer Science+Business Media|Springer]]
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| | location = Berlin
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| | year = 1993
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| | isbn = 3-540-55640-0}}
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| ==External links==
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| * {{MathWorld|title=Gauss's Class Number Problem|urlname=GausssClassNumberProblem}}
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| [[Category:Algebraic number theory]]
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| [[Category:Mathematical problems]]
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