Original writings by Avi Sion on the theory and practice of inductive and deductive LOGIC  

The Logician   … Philosophy, Epistemology, Phenomenology, Aetiology, Psychology, Meditation …

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Future Logic
Judaic Logic
Buddhist Illogic
Logic of Causation
Volition & Allied
A Fortiori Logic
Other Writings
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The Logician

© Avi Sion

All rights reserved


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Avi Sion,

Ph.D. (Philosophy)


Welcome !   The Logician  is a rich lode of original writings on 

the theory and application of inductive as well as deductive LOGIC

... and on Philosophy, Epistemology, Phenomenology, Modality, Causality, 

Psychology, Meditation, Ethics, Theology, Religions, and other interesting topics.


The Logician website makes available for study, free of charge, the full texts of the following published books by Avi Sion (that is some 500 web pages, or some 3000 letter-sized pages; plus over 100 supporting documents in .pdf format): place mouse over cover images to see brief abstracts

 FUTURE LOGIC - Categorical and Conditional Deduction and Induction of the Natural, Temporal, Extensional, and Logical Modalities (1990; rev. ed. 1996). Preview selected results.

 PHENOMENOLOGY - Basing Knowledge On Appearance (2003; expanded 2005).

 JUDAIC LOGIC - A Formal Analysis of Biblical, Talmudic and Rabbinic Logic (1995; Slatkine ed. 1997).

 BUDDHIST ILLOGIC - A Critical Analysis of Nagarjuna's Arguments (2002).

 THE LOGIC OF CAUSATION - Definition, Induction and Deduction of Deterministic Causality (1999, 2003 & 2010). 
 Phase III is now truly completed and published in Third Edition of the printed book and online. Preview selected results.

 Companion volume to The Logic of Causation, this is an important though so far little read work.

 RUMINATIONS - Sundry notes and essays on Logic (2005).

 MEDITATIONS - A Spiritual Logbook (2006).

 LOGICAL AND SPIRITUAL REFLECTIONS (2008). This comprises six shorter works, namely: Hume's Problems with Induction, A Short Critique of Kant's Unreason, In Defense of Aristotle's Laws of Thought, More Meditations, Zen Judaism and No to Sodom.

Latest!  A FORTIORI LOGIC: Innovations, History and Assessments (2013).

and OTHER WRITINGS - Four more published books, namely The Laws of Thought, The Self, Ethics and Theology are not displayed as such in this website, being "Thematic Compilations" drawn from the other books; however, approximate links to the various chapters/sections used in them may be found here. Among other things posted here is the political essay Logic in Defense of Zionism.

Another derivative volume is Logical Philosophy: A Compendium. (2013). This brings together five works by Avi Sion published in 2002-06, namely: Phenomenology (2003), Volition and Allied Causal Concepts (2004), Meditations (2006), Ruminations (2005), and Buddhist Illogic (2002). This collection does not include work done on The Logic of Causation in the same period (published in 2003, 2005).

Physical copies of all or some of these books have been donated to over a hundred and twenty university and public libraries across the world.

The above writings can be read online free of charge in '3D flipbook' format at www.AviSionBooks.com. New!

All published books by Avi Sion can also be consulted free of charge in the Google Books and Google Play facilities. They are also available for subscribers to read in Scribd.com.

Please read the Copyright Notice. The writings published in TheLogician.net have all been copyrighted by their author at different times, and are thus under the full protection of international and pan-American copyright conventions.

Many people, including me, find it easier to study from a paper book than reading on a computer screen; for the more technical topics, it would seem to me essential. You can purchase a printed copy of any of my books at CREATESPACE.COM and AMAZON.COM (in paperback), as well as at LULU.COM (in paperback, and also for the larger books, in hardcover) and other online stores (notably, BarnesandNoble.com). If you would like a printed book and cannot afford it, ask your local public or university library to order a copy.

You can also purchase all my books from Amazon.com and Lulu.com (follow links above) in 'eBook' form (kindle and epub, respectively). You can also buy and download all the books in Google Play, as well as in the online stores of: Apple's iTunes®, iPhone®, iPad®, or iPod touch®, and Barnes & Noble's Nook™. If you have a Sony or Kobo reader, you can also download some eBooks of mine from their stores.

Other external services: Check out AVI SION'S BLOG, which highlights various discoveries and ideas found in The Logician. You may post comments at the blog. The Logic Forum is a place where you can publish (free of charge) articles on logic, epistemology and related philosophical or scientific topics. The latter service also has a Guestbook and a Discussion Area to encourage feedback from you. (The Comments facility on The Logician website has been discontinued.) See also the book listings in the Open Library and in Online Books.

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If you come across any technical glitch or typing error, or any factual mistake or error of reasoning, please do report it and it will be quickly corrected with thanks. Likewise, if you have any other comments or queries you would like me to respond to personally, feel free to write to the following e-mail address:   avi-sion@thelogician.net   - but preferably use the Readers' Comments facility above described so other readers can partake and benefit. Please avoid personal questions and long dialogues.

Machine-made translations of The Logician texts into over forty languages are now available. These are unfortunately of very poor quality, but may be useful to some people. Either click on this hyperlink: Translations, or use the Google translate gadget in the sidebar (left). Once you have translated one page, you can follow the links on it as usual and the subsequent pages will also be automatically translated.

If you find The Logician website interesting and useful, be sure to recommend it to your friends and colleagues! Notice the "Share" gadget placed on every page (on the right side, near the top) to facilitate networking. If you have a website or blog, or are involved in a third-party forum discussion, do insert a link to The Logician in it. The Logician includes translations in many languages, but is not necessarily included in foreign language search engines; you would render us a great service if you would add TheLogician.net url to non-English language search engines.


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Study recommendations: These are large and complicated treatises, which attempt to answer certain ages-old philosophical questions in novel ways. They each took several years - thousands of hours - to develop and write, as their subject matters demanded; so do not expect to absorb them in a few minutes by reading a sentence here and a chapter there. They cannot be skimmed over casually, but require dedicated, attentive study over a long period of time. The most important chapters are not placed first or highlighted, but each subject is developed gradually and sequentially so that an intent student is sure to understand and profit.

Note that each book has an Abstract and a Table of Contents look through these first, to get an overall picture. To gather momentum, read at least one chapter a week; but, to give yourself time to reflect, do not read more than one chapter a day. Always read the footnotes, they are intended as integral parts of the text. To navigate, use the buttons at the top (to choose a book), on the left (to choose a part or chapter) and at the bottom (to go to the next or previous chapter within a part), and of course your browser's back and forward arrows (to return to previously seen web pages). You can also use the General Sitemap.

Good reading! If you have the courage and you persevere, you will surely find it well worth the effort. "A journey of a thousand miles begins with the first step"...


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Avi Sion © 2001 - 14 - All Rights Reserved.

Launched: 11 May 2001.   Last edited: 25 November 2014.

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