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Keychain: Zernike polynomial Z(8,4) Keychain
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Aluminum Circle
+$2.10
+$2.10
+$10.35
+$10.35
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Keychain: Zernike polynomial Z(8,4) Keychain
In 1933, Nobel Laureate Frits Zernike published a set of orthogonal polynomials designed to span the unit disc for the purpose of describing the aberrations of a circular mirror. Today these same polynomials are used to codify the imperfections in optical systems such as telescopes. Ophthalmologists and optometrists use them in wavefront guided vision correction. This magnet features the Zernike polynomial of order 8 and angular frequency 4, a complex valued function.
Customer Reviews
4.6 out of 5 stars rating5.4K Total Reviews
5,410 Reviews
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5 out of 5 stars rating
By Ali Y.February 4, 2026 • Verified Purchase
Aluminum Circle, 2"
Lovely & cute keychains i love them thank you sooo much ,they also reached to me soo fast 😍.
5 out of 5 stars rating
By linda f.June 18, 2025 • Verified Purchase
Premium Round, Small (1.44")
So cute and this is perfect!!!
5 out of 5 stars rating
By Christina J.March 11, 2024 • Verified Purchase
Premium Round, Large (2.125")
These are a durable metal and the colors are vibrant. One of the clasp came broken but received a new one quickly. Customer service was responsive and quick to resolve the issue. They are bigger than I thought but still work for my wedding. I am satisfied with the print quality and surprised at how vibrant the colors are.
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Product ID: 146210567012114943
Created on: 6/14/2009, 11:38 AM
Rating: G
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