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Single Idea 12572
[filed under theme 4. Formal Logic / A. Syllogistic Logic / 2. Syllogistic Logic
]
Full Idea
There are many men that reason exceeding clear and rightly, who know not how to make a syllogism
Gist of Idea
Many people can reason well, yet can't make a syllogism
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 4.17.04)
Book Ref
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.670
A Reaction
On the one hand this is just Locke's scepticism about the whole business of Aristotelian logic, but on the other hand it may be a perspicuous observation that logical thought extends far beyond what was catalogued by Aristotle.
The
14 ideas
with the same theme
[general ideas about formal arguments in syllogism form]:
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13819
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Aristotle's said some Fs are G or some Fs are not G, forgetting that there might be no Fs
[Bostock on Aristotle]
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20778
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Stoics like syllogisms, for showing what is demonstrative, which corrects opinions
[Stoic school, by Diog. Laertius]
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8084
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Syllogisms are verbal fencing, not discovery
[Locke]
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12572
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Many people can reason well, yet can't make a syllogism
[Locke]
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18806
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Frege thought traditional categories had psychological and linguistic impurities
[Frege, by Rumfitt]
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14453
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The Darapti syllogism is fallacious: All M is S, all M is P, so some S is P' - but if there is no M?
[Russell]
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5401
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The mortality of Socrates is more certain from induction than it is from deduction
[Russell]
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18949
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The universal syllogism is now expressed as the transitivity of subclasses
[Putnam]
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15879
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The Square of Opposition has two contradictory pairs, one contrary pair, and one sub-contrary pair
[Harré]
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13439
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Venn Diagrams map three predicates into eight compartments, then look for the conclusion
[Bostock]
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19006
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An 'enthymeme' is an argument with an indispensable unstated assumption
[Yablo]
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8081
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'No councillors are bankers' and 'All bankers are athletes' implies 'Some athletes are not councillors'
[Devlin]
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10688
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'Equivocation' is when terms do not mean the same thing in premises and conclusion
[Beall/Restall]
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13915
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Syllogistic can't handle sentences with singular terms, or relational terms, or compound sentences
[Engelbretsen/Sayward]
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