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integral necklace | sterling silver
For a woman who works with calculus, ∫ is part of her handwriting, on whiteboards, in notebooks, in the margins of her thesis. An integral necklace lets her wear the sign she writes every day. From a partner, it says you know what all those pages took.
Who It's For
- a daughter graduating in maths, physics or engineering
- a maths teacher, as a thank-you at the end of the school year
- a PhD student in statistics or applied maths, on the day she defends
- a friend who still remembers the moment calculus made sense
- yourself, if integrals are part of your working day
What the Integral Sign Means
An integral adds up something that changes continuously. To find the area under a curve, cut it into thin strips, add their areas, and let the strips grow thinner without end. For a well-behaved curve, the limit of those sums is the integral. Leibniz's notation keeps the picture: ∫ f(x) dx reads as a sum of strips of height f(x) and width dx. The fundamental theorem of calculus ties integrals to derivatives: in a precise sense, each undoes the other. The idea is far older than the sign. In the third century BC, Archimedes filled a segment of a parabola with ever smaller triangles and proved it has four-thirds the area of the triangle with the same base and height.
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FAQ
How big is the pendant, and how does it hang?
The pendant measures 32 mm (about 1.3 inches), about 6 mm more than the width of a 2-euro coin. It is a slim piece that hangs upright from a small loop at the top and sits below the collarbone, on a 45 cm (17.7 inch) sterling silver chain with a 5 cm (2 inch) extender. Extra chains of 40, 42, 45 or 50 cm with the extender, or 80 cm, can be added on this page in silver or gold vermeil. It is 925 sterling silver, nickel-free and hypoallergenic.
Is there a gold integral necklace?
Yes. The integral necklace also comes in 18K gold vermeil (2.5 microns of 18K gold over sterling silver), at the same 32 mm, on a 45 cm gold vermeil chain with a 5 cm extender. Choose the finish she already wears. The design is the same in both.
Will it arrive in time, and what if it isn't right?
DHL Express delivers free in 1-5 business days worldwide, and we pay the import duties and taxes, so nothing is due at the door. It arrives in a ready-to-gift jewelry box and festive envelope. If it isn't right, our 30-day “Love It or Return It” policy applies.
Why is the integral sign a long S?
Because Leibniz thought of an integral as a sum. He had been writing omn., short for the Latin omnia (all), in front of the quantities he summed. In a manuscript dated 29 October 1675, he wrote that it would be useful to write ∫ instead: a long s, for summa. The sign first appeared in print in June 1686, in Acta Eruditorum. The name came later. Jacob Bernoulli printed the word integral in 1690, and Leibniz, who had called integration a calculus of sums, came round to it.
Math & Physics
Unlock the elegance of the abstract with our math and physics-inspired jewelry collection. These carefully crafted pieces mirror the profound equations and natural laws that shape our understanding of the universe. Experience the allure of fractals, the rhythmic beauty of pi, and the celestial wonder of astral formations—each piece serves as a wearable homage to the artistry inherent in scientific inquiry.
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