So, according to Riemann, because a straw can be cut only once — from end to end — it has exactly one hole.
Does a straw have 1 hole or 2 holes?
Topologically, a straw is the product of a unit circle and an interval. The interval is the length of the straw. The circle has one hole, and the interval has no holes. Therefore, a straw has a single hole.
Does a straw have two holes type questions?
“It has one hole, because it’s topologically equivalent to a doughnut and a coffee cup (and some would say a human, though we’re arguably more of a genus-5).” “One hole, it’s topologically alike to a donut. And, fun fact: a human. One entrance, one exit.”
How many holes does a cup have?
A bowl has no holes (genus 0), a coffee cup has one (through the handle – making it genus 1), a pair of spectacles (without the pieces of glass) has two holes (genus 2), and a pretzel can have three holes (genus 3).
What shape is a straw?
But that’s wrong. Let’s describe a straw mathematically. A straw is the product of a circle and an interval; a topologist would denote this S¹ × I, where S¹ is usually thought of as the unit circle in the plane and I is the interval [0, L] (here L = the length of the straw).
How is straw made?
Straw is an agricultural byproduct consisting of the dry stalks of cereal plants after the grain and chaff have been removed. It makes up about half of the yield of cereal crops such as barley, oats, rice, rye and wheat.
How many holes does a sock have?
Yeah! Me: I was thinking about that and wondering whether there are any kinds of clothing that have one hole or two holes. T: Socks have one hole!
How many holes are there in a shirt?
As a normal T-shirt, we know it has 4 holes, 2 for the arms, one for the head, and one at the waist.
How many holes are in a polo?
It asks you “How many holes in a polo?”, with the possible answers being all numbers from one to four. The answer to the question is “4”, since it’s talking about the holes in the letters that form the words “a polo”. There is one hole each in the letters A, P, and the two O’s.
How many holes does a pair of pants have?
A pair of pants is any surface that is homeomorphic to a sphere with three holes, which formally is the result of removing from the sphere three open disks with pairwise disjoint closures.
What is a hole in a hole?
A Hole in a Hole in a Hole – Numberphile
What makes a hole a hole?
A hole is an opening in or through a particular medium, usually a solid body. Holes occur through natural and artificial processes, and may be useful for various purposes, or may represent a problem needing to be addressed in many fields of engineering.
What is a hole in math?
A hole in a mathematical object is a topological structure which prevents the object from being continuously shrunk to a point.
What is straw hay?
Hay is a crop that is grown and harvested as a feed crop for cattle, horses and other farm animals. Straw on the other hand is a byproduct of a grain crop; in our area it’s usually usually wheat straw that we see.
Why is straw called straw?
Where did the name ‘straw’ come from? In the 1800s, the cut hollow stems of cereal grasses were commonly used as drinking tubes. When these grasses are dried they are, of course, called ‘straw’ — hence the name of such drinking tubes being ‘straws’.
What is wheat straw?
Wheat straw is the stalk left over after wheat grains are harvested. Traditionally, it has been treated as a waste. In some countries, farmers burn it, contributing to air pollution and creating a public health hazard.
Does a sock have a hole?
Although any sock can develop holes, thinner nylon socks are usually the first to break down. Remember, even expensive socks can end up being socks with holes. Good socks mean happy feet no matter how hard you work or play.
Does a sock have a hole topology?
But on the other hand, topological holes are like holes in your socks. Socks are a really good example because no one refers to the inside of a sock as a “hole”. If a sock is in good repair it has no holes despite the fact that it superficially resembles a floppy cup.