# Tube domain

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tube

A domain in the complex space of the form

where is a domain in the real subspace , called the base of the tube domain . A domain of the form is also called a tube domain. The holomorphic envelope of an arbitrary tube domain is the same as its convex hull; in particular, every function that is holomorphic in a tube domain can be extended to a function that is holomorphic in the convex hull of . A tube domain is said to be radial if its base is a connected cone in .

#### References

 [1] V.S. Vladimirov, "Methods of the theory of functions of many complex variables" , M.I.T. (1966) (Translated from Russian)

#### References

 [a1] L. Hörmander, "An introduction to complex analysis in several variables" , North-Holland (1973) pp. Chapt. 2.4
How to Cite This Entry:
Tube domain. E.M. Chirka (originator), Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Tube_domain&oldid=15666
This text originally appeared in Encyclopedia of Mathematics - ISBN 1402006098