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Our workbook enables students to master skills they previously could not. We recognize that the conventional approach... Read More >>
Purple Tiles 1 Dotted Grid Notebook Are you bored with lifeless notebooks that all look similar? This... Read More >>
An (equational) implication/disjunction system for a class of algebrasis a set of quadruple equations defining implication/disjunction... Read More >>
In preparing this book, the author had especially in mind classes in the uppergrades of grammar schools, though... Read More >>