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2. Complex number - Wikipedia

   en.wikipedia.org/wiki/Complex_number

   More precisely, the fundamental theorem of algebra asserts that every non-constant polynomial equation with real or complex coefficients has a solution which is a complex number. For example, the equation (+) = has no real solution, because the square of a real number cannot be negative, but has the two nonreal complex solutions + and .

3. Complex Lie group - Wikipedia

   en.wikipedia.org/wiki/Complex_Lie_group

   Basic examples are ⁡ (), the general linear groups over the complex numbers. A connected compact complex Lie group is precisely a complex torus (not to be confused with the complex Lie group ). Any finite group may be given the structure of a complex Lie group. A complex semisimple Lie group is a linear algebraic group. The Lie algebra of a ...

4. Resolvent set - Wikipedia

   en.wikipedia.org/wiki/Resolvent_set

   In linear algebra and operator theory, the resolvent set of a linear operator is a set of complex numbers for which the operator is in some sense "well-behaved". The resolvent set plays an important role in the resolvent formalism .

5. Linear algebra - Wikipedia

   en.wikipedia.org/wiki/Linear_algebra

   In multilinear algebra, one considers multivariable linear transformations, that is, mappings that are linear in each of a number of different variables. This line of inquiry naturally leads to the idea of the dual space , the vector space V* consisting of linear maps f : V → F where F is the field of scalars.

6. Linear complex structure - Wikipedia

   en.wikipedia.org/wiki/Linear_complex_structure

   The fundamental example of a linear complex structure is the structure on R 2n coming from the complex structure on C n.That is, the complex n-dimensional space C n is also a real 2n-dimensional space – using the same vector addition and real scalar multiplication – while multiplication by the complex number i is not only a complex linear transform of the space, thought of as a complex ...

7. Fredholm alternative - Wikipedia

   en.wikipedia.org/wiki/Fredholm_alternative

   The Fredholm alternative is the statement that, for every non-zero fixed complex number, either the first equation has a non-trivial solution, or the second equation has a solution for all (). A sufficient condition for this statement to be true is for K ( x , y ) {\displaystyle K(x,y)} to be square integrable on the rectangle [ a , b ] × [ a ...