36 Notations
| Notation | Description | Source |
| $1$ | Identity element of a unital algebra. | Definition 33.1.2 |
| $G(A)$ | Invertible group of a unital algebra. | Definition 33.2.1 |
| $G_{0}(A)$ | The identity component of $G(A)$. | Definition 33.3.1 |
| $I(A)$ | The index group of $A$. | Definition 33.3.3 |
| $\sigma_{A}(x) = \sigma(x)$ | The spectrum of $x$ in $A$. | Definition 33.5.1 |
| $R_{x}(\lambda)$ | The resolvent of $x$. | Definition 33.5.3 |
| $[x]_{sp}$ | The spectral radius of $x$. | Definition 33.5.2 |
| $\Omega(A)$ | Space of multiplicative functionals on $A$. | Definition 33.7.1 |
| $\cm(A)$ | Maximal ideal space of $A$. | Definition 33.4.3 |
| $\Gamma = \Gamma_{A}$ | The Gelfand transform on $A$. | Definition 33.8.1 |
$M_{n}(\complex)$ | Algebra of $n \times n$ matrices over $\complex$. | Definition 35.1.1 |
| $B(H)$ | Algebra of bounded operators on a Hilbert space. | Definition 35.2.1 |
| $A(D)$ | The disk algebra. | Definition 35.5.1 |
| $H^{\infty}(D)$ | The Hardy space. | Definition 35.4.1 |
| $\ell^{1}(\integer)$ | Convolution algebra on $\integer$. | Definition 35.6.1 |
| $\delta_{0}$ | Multiplicative unit of $\ell^{1}(\integer)$. | Definition 35.6.1 |
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