INVALIDITY OF “SUBJECT-OBVERSION” RULE

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AZIMI MAHDI

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Journal: Philosophy and Kalam Year:2014 | Volume:46 | Issue:2 Page(s): 83-100

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Information Journal Paper

Title

INVALIDITY OF “SUBJECT-OBVERSION” RULE

Author(s)

AZIMI MAHDI | Issue Writer Certificate

Keywords

SUBJECT-OBVERSIONQ2

MOST EXTENSIVE UNIVERSALQ2

ISLAMIC LOGICQ2

Abstract

In contemporary texts of ISLAMIC LOGIC, the “SUBJECT-OBVERSION” has been introduced as a rule on basis of which one can replace the subject term of a categorical proposition with its complement and change both quality and quantity of the proposition. Thus from an A-proposition such as “all A is B”, onecan infer “Some not-A is not B”. Well, let's take that A is included by B but notvice versa, and B is MOST EXTENSIVE UNIVERSAL such as “existent” or “thing”. In this case “all A is B” produces the contradictory of our favorite conclusion, i.e. “all not-A is B”. Therefore, the so-called SUBJECT-OBVERSION rule, at least in A-proposition, is not logically valid.

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APA: Copy

AZIMI, MAHDI. (2014). INVALIDITY OF “SUBJECT-OBVERSION” RULE. FALSAFE VA KALAM-E ESLAMI (IRANIAN JOURNAL FOR THE PHILOSOPHY & KALAM) (MAQALAT WA BARRASIHA), 46(2), 83-100. SID. https://sid.ir/paper/198383/en

Vancouver: Copy

AZIMI MAHDI. INVALIDITY OF “SUBJECT-OBVERSION” RULE. FALSAFE VA KALAM-E ESLAMI (IRANIAN JOURNAL FOR THE PHILOSOPHY & KALAM) (MAQALAT WA BARRASIHA)[Internet]. 2014;46(2):83-100. Available from: https://sid.ir/paper/198383/en

IEEE: Copy

MAHDI AZIMI, “INVALIDITY OF “SUBJECT-OBVERSION” RULE,” FALSAFE VA KALAM-E ESLAMI (IRANIAN JOURNAL FOR THE PHILOSOPHY & KALAM) (MAQALAT WA BARRASIHA), vol. 46, no. 2, pp. 83–100, 2014, [Online]. Available: https://sid.ir/paper/198383/en

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