Is it, how important recycling is to reduce waste and increase environmental sustainability? Or, a method to reduce the massive amounts of trash accumulating in landfills all over the world? I live and breath recycling, it's what I do, and even though these are important points about recycling, the first thing that always pops in my head when I hear the word, recycling, is the three arrows of the recycling symbol. It got me wondering one day who was the genius behind the well-known symbol. The three arrows have been incorporated into everything pertaining to recycling, recyclable, and recycled products.
Möbius strip - Simple English Wikipedia, the free encyclopedia
It can be made using a strip of paper by gluing the two ends together with a half-twist. The Mobius strip is known for its unusual properties. A bug crawling along the center line of the loop would go around twice before coming back to its starting point. Cutting one third of the way in from the edge and parallel to it produces another amusing result.
Recycling Symbol History
It can be realized as a ruled surface. Its boundary is a simple closed curve, that is, homeomorphic to a circle. Some of these can be smoothly modeled in Euclidean space , and others cannot. In particular, the twisted paper model is a developable surface , having zero Gaussian curvature. A system of differential-algebraic equations that describes models of this type was published in together with its numerical solution.
In the field of symplectic geometry, a central issue involves how to count the intersection points of two complicated geometric spaces. The question is: How many times do the two circles intersect each other? Mathematicians want to count intersection points, but certain obstacles prevent them from counting all those points directly. However, if mathematicians are not careful about how they combine counts from local regions, they can easily end up with the wrong count for the whole manifold. The delicacy of adding local counts together is evident in this simple example.