# Tube domain

From Encyclopedia of Mathematics

*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) |

#### Comments

#### 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