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Logic / Unit 9   Logic 439 review, 2 to 3 minutes

Capstone: Full Essay Analysis

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The idea

This capstone maps a complete short essay, reconstructs each argument in it, then tests every one with the machinery its type calls for — categorical, propositional, statistical, and fallacy analysis in a single pass.

In practice

The essay argues that a city should adopt a four-day working week. Map it at scale first: one main conclusion, three supporting arguments, one anticipated objection. Reconstruct each. The first argument is a syllogism — all policies that raise measured productivity deserve trial, this policy raises measured productivity, so it deserves trial. Test it with the categorical machinery: figure one, AAA, valid. The second is propositional — if the trial fails, the city reverts at no cost; the city can bear no cost; so the trial is worth running. Symbolise and table it. The form is affirming the consequent, and it is invalid; the essay's strongest-sounding argument is its weakest. The third rests on a statistic: firms trialling the change reported a twenty percent drop in absenteeism. Run the four questions. Who was measured, how was absenteeism defined, was the comparison group similar, and who funded the study? Two of the four go unanswered in the essay, so the claim is usable but unverified. Now the fallacy pass. The essay dismisses one critic as a career contrarian, which is an attack on the person and is tagged. It also cites labour economists on productivity measurement, which resembles an appeal to authority and is acquitted — relevant expertise, inside its field. Closing frame: the map with each argument coloured by verdict. One valid, one invalid, one unverified, one fallacy, one acquittal.

Where people slip

An essay is not sound because most of its arguments survive. The main conclusion inherits the strength of the argument actually carrying it, and a well-supported side point can leave a reader convinced of a claim that nothing in the essay established.

Your place on the trail

Every lesson rests on earlier ones and opens later ones. Tap any to jump.

Builds on

  • Nothing. This is a starting point.

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