Higher dimensional symplectic geometries are defined analogously. Alcohols behave analogously giving the borate esters, e.g. trimethyl borate. So in that regard subalgebras behave analogously to subsets. The preceding Euler-type integrals follow analogously. Negative definite and negative semi-definite matrices are defined analogously. Analogously to lead monoxide, lead dioxide is capable of forming plumbate anions. Based upon neuronal expression, amphetamine is thought to affect norepinephrine analogously to dopamine. A gyro-BWO is an oscillator that functions analogously to a backward wave oscillator (BWO). A gyro-klystron is an amplifier that functions analogously to a klystron tube. The three-dimensional case is defined analogously. A software adapter fulfills the task of effecting these transformations, analogously to a physical adapter. Analogously to the univariate case, the Hessian is required to be negative definite. Analogously to the pseudohalogens, they have sometimes been called "pseudo-alkali metals". Secondary phosphines are prepared analogously to the primary phosphines. It is prepared analogously to the isopropoxide.