Math tables, e.g

Usage examples of matrixes.

He had practiced enough in boyhood, in the tiny gliders levitated by small matrixes and soaring on the air currents around the Lake of Hali, to be aware of the elementary principles of heavier-than-air flight, but it was incredible to him that a matrix circle, a group of close-linked telepath minds, could charge a battery strongly enough to power such enormous turbines.

As far as we know, that was the only one of those old matrixes from the Ages of Chaos left on our world.

Gift of the Hasturs may have been what was trained into the Keepers: the ability to work with other matrixes, without the elaborate safeguards a Keeper must have.

Old tales made matrixes magical, called them gates to sorcery and alien magic.

The main side effect, for men, is that prolonged or heavy work in the matrixes temporarily closes off the channels to sex, and the man undergoes a prolonged period of impotence.

While a woman is working at the center of a circle, holding the tremendous forces of the amplified linked matrixes, she must keep the physical channels clear for that work, or she can burn up like a torch.

Mikhail glanced at his wife, but for once the nearness of many matrixes did not appear to be disturbing to her.

Focusing on the joined matrixes again, the workers concentrated upon the moisture in the air, the nearing clouds, to wrap the whole of the mountainside in a thick curtain, rising from the river below, until all of Castle Aldaran and the nearby peaks lay shrouded in darkening fog.

Now with three minds and three matrixes focused, they sent the healing-spell beating out through all the castle, and from cellar to attic and everywhere in the crowded courtyard, servants and soldiers and guardsmen and stableboys came out of the dazed trance wherein each had heard the cries of whoever he loved best and fought blindly to rescue that one from the hands of a nameless enemy.