[ \mathbbBC = (z_1, z_2) \mid z_1, z_2 \in \mathbbC ]
[ | \lambda x | = |\lambda| \mathbbC | x | \quad \textor more generally \quad | \lambda x | = |\lambda| \mathbbBC | x | ? ] But ( |\lambda|_\mathbbBC = \sqrtz_2 ) works, giving a real norm. However, to preserve the bicomplex structure, one uses :
This decomposition is the key to bicomplex analysis: it reduces bicomplex problems to two independent complex problems . In classical functional analysis, we work with vector spaces over ( \mathbbR ) or ( \mathbbC ). Over ( \mathbbBC ), a bicomplex module replaces the vector space, but caution: ( \mathbbBC ) is not a division algebra (it has zero divisors, e.g., ( \mathbfe_1 \cdot \mathbfe_2 = 0 ) but neither factor is zero). Hence, we cannot define a bicomplex-valued norm in the usual sense—the triangle inequality fails due to zero divisors. Basics of Functional Analysis with Bicomplex Sc...
with componentwise addition and multiplication. Equivalently, introduce an independent imaginary unit ( \mathbfj ) (where ( \mathbfj^2 = -1 ), commuting with ( i )), and write:
The bicomplex spectrum of ( T ) is: [ \sigma_\mathbbBC(T) = \lambda \in \mathbbBC : \lambda I - T \text is not invertible . ] In idempotent form: [ \sigma_\mathbbBC(T) = \sigma_\mathbbC(T_1) \mathbfe 1 + \sigma \mathbbC(T_2) \mathbfe_2 ] where the sum is in the sense of idempotent decomposition: ( \alpha \mathbfe_1 + \beta \mathbfe_2 : \alpha \in \sigma(T_1), \beta \in \sigma(T_2) ). [ \mathbbBC = (z_1, z_2) \mid z_1, z_2
( T ) is bounded if there exists ( M > 0 ) such that ( | T x | \leq M | x | ) for all ( x ). This is equivalent to ( T_1 ) and ( T_2 ) being bounded complex operators.
Below is a structured feature written for a mathematical audience (advanced undergraduates, graduate students, or researchers). It introduces the core concepts, motivations, key theorems, and applications of this emerging field. Feature: A New Dimension in Analysis For over a century, functional analysis has been built upon the solid ground of real and complex numbers. But what if the scalars themselves could be two-dimensional complex numbers? Enter bicomplex numbers —a commutative, four-dimensional algebra that extends complex numbers in a natural way. This feature explores the foundational shift when we redevelop functional analysis using bicomplex scalars: bicomplex Banach spaces, bicomplex linear operators, and the surprising geometry of idempotents. 1. The Bicomplex Number System: A Quick Primer A bicomplex number is an ordered pair of complex numbers, denoted as: In classical functional analysis, we work with vector
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