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The beautiful Euler's identity and Euler's formula presented on one stainless steel card.

The Card of Euler's Identity

    • On the front side of the card, Euler's identity and its introduction are sharply etched, with Euler's formula stated at the bottom
    • On the back side of the card, the Euler's formula and its proof using power series are presented
    • All the information and graphics are chemically etched into, or, in other words, "physically" cut away from the stainless steel card. As a result, they are very sharp and clear, and will never fade nor wear off.
    • The card is made of high-quality 304 stainless steel and is tough, strong and corrosion resistant. It is built to last a lifetime or even centuries.
    • The thickness is enhanced to 0.8 mm
    • The luxurious matt surface of the card is resistant to scratches and fingerprints
    • Same size as a credit card (85.5 mm x 54 mm)
    • Made in the United Kingdom
    • All images are for reference only. The photos may be slightly different from the actual item in terms of colour due to the lighting during photo shooting or the monitor's display.
    • The card sleeve shown in the product images is not included. It can be purchased here:
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