MATRICES AND VECTORS

Matrices are universally denoted by upper-case boldface. Vectors are lower-case boldface everywhere except in the conjugate-gradient section of chapter , where vectors are capitalized when in transform space.

		${\bf x}$ 		generic model space, often unknown
		${\bf y}$ 		generic data space
		${\bf d}$ 		data, given
		${\bf A}$ 		generic matrix
		${\bf B}$ 		generic matrix
		${\bf B'}$ 		conjugate transpose of generic matrix
		${\bf I}$ 		identity matrix
		${\bf U}$ 		unitary or pseudounitary matrix
		${\bf W}$ 		weighting diagonal matrix
		${\bf D}$ 		diagonal matrix
		${\bf N}$ 		NMO (normal-moveout) matrix
		${\bf T}$ 		tridiagonal matrix; matrix with time t on diagonal
		Q 		quadratic form