- Accepts Etsy gift cards
This design neatly illustrates a couple of interesting characteristics of 'square' numbers - that is numbers where you start with a number (call it 'k') and multiply it by itself to get k^2 (k to the power 2).
Firstly it shows in a straightforward way that when you have a number k^2, the next square number in size will be k^2+2k+1. The triangle at the top of the design shows another interesting quality. If you built up an equliateral triangle out of smaller triangles, every time you add another row you add (2k+1) times the number of the row. That means that the number of small triangles in a four row triangle, for instance, is 16 or 4^2, the square number for the row.
As always there's a fuller explanation at
Designed by David Lawrence, d/dx art prints are created from 315 gsm Canson Infinity Museum Rag produced at the centuries-old Arches paper mill in France. This superb art paper is acid-free and uses no optical brighteners to degrade over time. Ultrachrome K3 inks provide vivid colours which will last without fading for many decades in normal conditions. The robustness of the paper makes DIY framing a simple matter.
The prints are standard European A4 (210*297mm) in size and are unframed. They are packed flat in crystal envelopes with cardboard stiffener and posted in a rigid container via Royal Mail first class.
You can find more about the background to the prints at www.ddxart.co.uk
We accept credit card, debit card, etsy gift cards, and PayPal payments through Etsy.
We post items wherever possible within 2 working days. Prints are posted in rigid boxes via Royal Mail (First Class within the UK).
Just contact me within: 14 days of delivery
Ship items back to me within: 30 days of delivery
But please contact me if you have any problems with your order.
Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:
In the unlikely event that there is a flaw in your print we are happy to exchange it or refund the price on return. In the event of damage in transit, it helps if you can provide photographic or other evidence so that we can claim from Royal Mail.
The colours you are seeing on your monitor are inevitably not precisely the colours you would see if you were looking at the same design in printed form. There is simply no way around that, since the internet places limits on the range of colours that can be displayed and, even if that were not the case, every monitor is subtly (sometimes wildly!) different in the way it displays colours.
But you can be reassured that the quality of our equipment is such that colours and quality are consistent over time and the print you receive will be identical to other prints sold in galleries and art fairs to buyers who have every opportunity to handle and assess them.