J. Czelakowski Books

Protoalgebraic Logics

By J. Czelakowski, Janusz Czelakowski, Priest, Graham, Mundici, Daniele

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the Main Aim Of This Monograph Is To Provide A Structured Study Of The Algebraic Method In Metalogic. In Contrast To Traditional Algebraic Logic, Where The Focus Is On The Algebraic Forms Of Specif...

Leśniewski'S Systems

By V.F. Rickey, J. Czelakowski, Stanisław Leśniewski, Instytut Filozofii I Socjologii (Polska Akademia Nauk), Jan T. J. Srzednicki, Jan T. J. Srzednicki, Zbigniew Stachniak (Auth.), Jan T. J. Srzednicki, Zbigniew Stachniak (Eds.)

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Stanislaw Lesniewski (1886-1939) was one of the leading Polish logicians and founders of the Warsaw School of Logic whose membership included, beside himself, Jan Lukasiewicz, Tadeusz Kotarbinski,...

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.