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Zorluk: ZorNecessary Assumption

Art Conservator: A seventeenth-century oil portrait recently attributed to the Dutch master Rembrandt features paint layers bound with walnut oil rather than linseed oil. Archival guild records demonstrate that seventeenth-century Dutch painters used linseed oil as their standard binding medium, whereas walnut oil was utilized almost exclusively by contemporary Italian workshops. Because Rembrandt worked exclusively in the Netherlands throughout his career and never traveled to Italy, the portrait was almost certainly painted by an Italian artist rather than Rembrandt.

Which one of the following is an assumption on which the art conservator's argument depends?

  1. A
    Seventeenth-century Italian painters never utilized linseed oil in any of their completed portraits.
  2. B
    Every painting produced in the Netherlands during the seventeenth century adhered without exception to Dutch guild material standards.
  3. Rembrandt did not obtain and utilize walnut oil imported from foreign artistic workshops.Cevap
  4. D
    Any seventeenth-century portrait bound with linseed oil was painted by an artist working in the Netherlands.
  5. E
    The artistic provenance of seventeenth-century paintings cannot be established accurately without chemical analysis of binding mediums.

Cevap

The statement that Rembrandt did not obtain and utilize walnut oil imported from foreign artistic workshops is an assumption required by the argument.
The argument concludes that the portrait must have been painted by an Italian artist because it contains walnut oil (an Italian medium) and Rembrandt never visited Italy. For this conclusion to hold, the author must assume that physical travel to Italy was the only way Rembrandt could have used walnut oil. If Rembrandt had obtained and used imported walnut oil while in the Netherlands, the presence of that medium would no longer rule out Rembrandt as the painter. Thus, the statement eliminating the possibility of imported walnut oil is essential to the argument.

Adım Adım Çözüm

1
Isolate the premises and conclusion of the argument.
Premises: Dutch painters standardly used linseed oil; Italian workshops almost exclusively used walnut oil; Rembrandt never visited Italy. Conclusion: The portrait containing walnut oil was almost certainly executed by an Italian artist rather than Rembrandt.
Clear identification of the logical structure reveals the unstated leap between geographic location and material usage.
2
Identify the unstated logical gap.
The conservator presumes that because Rembrandt never physically traveled to Italy, he could not have accessed or used Italian-style walnut oil in the Netherlands.
An artist could potentially acquire foreign materials via trade or importation without traveling abroad.
3
Apply the Negation Test to confirm necessity.
Negating the statement that Rembrandt did not obtain and use imported walnut oil yields: 'Rembrandt did obtain and use imported walnut oil.' If this is true, the presence of walnut oil on the portrait is fully consistent with Rembrandt having painted it, which directly invalidates the conclusion.
A necessary assumption must fatally undermine the conclusion when logically negated.

Anahtar Kavram

Necessary Assumption (Defender Assumption & Negation Test)
Tahmini Süre:1m 30s
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Konular

Necessary Assumption

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