Writers on Logic may be divided into two great classes as the first consisting of those who regard all Logic as having no other ultimate object than Reasoning and who contemplate all reasoning as typified in the Syllogism, the second consisting of those who recognize the independent value of the study of the intellectual operations of Conception and Judgment and who endeavour to refer the Laws of Universal Logic including therein the syllogism to certain primary laws as principles of thought e.g. the principles of identity, contradiction excluded middle and sufficient reason
KeywordsSolar System Sufficient Reason Logical Inference Mental Operation Rational Animal
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