David D. Connell Books

Despair in Monterey Bay Mathnet Casebooks No2

By David D. Connell, Jim Thurman

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The Map With a Gap Mathnet Casebooks No4

By David D. Connell, Jim Thurman

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Despair in Monterey Bay

By David D. Connell

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Mathnet detectives George Frankly and Pat Tuesday use various math skills--triangulation, calculating currents, and figuring falling speeds--to solve the mystery of the missing Disaster Diamond.

Despair in Monterey Bay

By David D. Connell

Average: 0.00, 0 Ratings

Mathnet detectives George Frankly and Pat Tuesday use various math skills--triangulation, calculating currents, and figuring falling speeds--to solve the mystery of the missing Disaster Diamond.

The case of the mystery weekend

By David D. Connell

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Math detectives George Frankly and Pat Tuesday take a wrong turn going to a mystery weekend and come to a manor where they need their math skills to solve a real mystery.

The case of the mystery weekend

By David D. Connell

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Math detectives George Frankly and Pat Tuesday take a wrong turn going to a mystery weekend and come to a manor where they need their math skills to solve a real mystery.

The case of the smart dummy

By David D. Connell

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Using clues derived from mathematical knowledge, Mathnet detectives Pat Tuesday and George Frankly solve a case involving a ventriloquist's stolen dummy and a suitcase filled with counterfeit money.

The case of the smart dummy

By David D. Connell

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Using clues derived from mathematical knowledge, Mathnet detectives Pat Tuesday and George Frankly solve a case involving a ventriloquist's stolen dummy and a suitcase filled with counterfeit money.

Case of the Unnatural

By David D. Connell, Jim Thurman, Danny O Leary

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The case of the unnatural

By David D. Connell

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Mathnet detectives George Frankly and Pat Tuesday use their knowledge of number sequences to crack a code and solve the mystery surrounding the phenomenal performance of a minor league baseball pit...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.