Book:Robert Recorde/The Whetstone of Witte, whiche is the seconde parte of Arithmeteke: containing the extraction of rootes; the cossike practise, with the rule of equation; and the workes of Surde Nombers

Subject Matter

 * Arithmetic

in which can be found:
 * a description of the cossist practice
 * the first appearance in print of the equals sign
 * the word zenzizenzizenzic.