Notation

Symbol				Definition
${\mathcal {H}}\,\!$				Hilbert Space
${\mathbb {C} }\,\!$				The set of complex numbers
${\mathbb {R} }\,\!$				The set of real numbers
Chapter 2
$X\,\!$				The Pauli X matrix (see Table 2.1)
$Y\,\!$				The Pauli Y matrix (see Table 2.1)
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${\delta _{ij}}$				The Kronecker delta (see Equation C.17)
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$\otimes \,\!$				The Tensor Product (see Section C.7)