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Heawood famously discovered that every map on a torus can be coloured with seven colours. This design does not include edge identifications. For more cool math t-shirts, please visit http://wearmath.com
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Product Description:
Save money & stay green with our reusable water bottle. Made from a single piece of aluminum. This lightweight, durable, eco-friendly, leak-proof bottle is good for you and good for the environment.
- Holds 0.6L (20oz)
- Measures 7" tall, 2.9" diameter
- Includes an aluminum carabiner
- Includes carabiner lid (pictured) & alternate pop-top style lid
- Do not freeze
- Printed in the USA
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