The universe of conceivable objects is represented by 1 or unity.

The calculus of logic by George Boole is part of the HackerNoon Books Series. Read this book online for free on HackerNoon!

The time in bank discount is always the number of days from the date of discounting to the date of maturity.

Accuracy and rapidity in counting out change can best be acquired by practice behind the counter or at the cash-desk.

All equations are thus of equal significance which give, on expansion, the same series of constituent equations, and all are interpretable.

The unitate of a number is the sum of its digits reduced to a unit.

This is a known transformation in logic, and is called conversion by contraposition, or negative conversion.

This rule of computing interest appears in some Canadian text-books, and, though simply a modification of other rules, is worthy of notice.

The transposition of figures is a frequent cause of errors in proving accounts and balance sheets.

In some respects this rule is superior to the well-known 60-day method of reckoning interest.