Exposing Fake Logic

Logical Criticism by Avi Sion

Blog posts : "a fortiori logic"



Exposing Fake Logic is composed of essays written after publication in 2013 of my work A Fortiori Logic, the product of major original research work spanning years. The core essays were written in reply to specific claims or counterclaims regarding a fortiori logic put forward by four differ…

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1. A Fortiori Argument, in General and in Judaism


This chapter[1] first details the formal relationships and distinctions between purely a fortiori argument, a crescendo argument (which refers to proportional a fortiori argument), pro rata argument, and qualitative and quantitative analogy. These various forms of argument are often confused, so…

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2. Luis Duarte D’Almeida

1.Luis Duarte D’Almeida


1.A second-hand conception

The subject of a fortiori argument is treated, mainly with legal perspectives, in a 2017 paper by Luis Duarte D’Almeida (henceforth, D’Almeida)[1] called Arguing a fortiori[2]. This is a pretentious essay, with few if any novel t…

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3. Mahmoud Zeraatpishe



In my 2013 book, A Fortiori Logic (henceforth AFL), I studied a fortiori argument in depth, examining in extensive and meticulous detail its formal varieties and its practical applications. I found and analyzed a great many examples of such argument in world literature, inc…

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4. Michael Avraham, et al.


The present essay[1] is in reply to the general letter (called “A general treatment of Avi Sion's critique,” signed by Dov Gabbay, Michael Avraham, Uri Schild) and specific comments (authored by Michael, and presumably endorsed by Dov and Uri) that you sent to me on 21.1.2014, in reply to …

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5. Bar Ilan’s Journal, BDD


1.Submission and rejection of an article

Back in January 2014, soon after I completed and published my book A Fortiori Logic, I went to Israel for a well-earned vacation. I met Prof. Ely Merzbach in Jerusalem over a cup of tea. We had met before, years ago in his office at Bar Ilan Univer…

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