Title
Variations on the Full Versus Strong Problem: in the Theory of Natural Dualities,Used
Delivery time: 8-12 business days (International)
At the time of writing, every known example of a full duality based on a quasivariety generated by a finite algebra has in fact been a strong duality. Is it the case that every full duality is a strong duality? This question goes back to the origins of the theory of natural dualities and was solved shortly after the writing of this work by Clark, Davey and Willard (2006). This work focuses on restrictions, and variations, of the above question. We first study the problem of when a full duality is necessarily strong. We also look at the restriction of this problem to the finite members of a given finitely generated quasivariety, where remarkably it has been shown that the notions of full and strong duality are not equivalent.
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Shipping & Returns
Shipping
We ship your order within 2–3 business days for USA deliveries and 5–8 business days for international shipments. Once your package has been dispatched from our warehouse, you'll receive an email confirmation with a tracking number, allowing you to track the status of your delivery.
Returns
To facilitate a smooth return process, a Return Authorization (RA) Number is required for all returns. Returns without a valid RA number will be declined and may incur additional fees. You can request an RA number within 15 days of the original delivery date. For more details, please refer to our Return & Refund Policy page.
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Warranty
We provide a 2-year limited warranty, from the date of purchase for all our products.
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
This warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
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Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Shopify Payments, Shop Pay and more.