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- Infinity, usually represented in maths by the symbol ∞ isn't a number. If it was, you could just add one and get a bigger number.
- There are an infinite number of infinities. This can easily be proved mathematically, using a few lines of equations.
- 1/0 isn't infinity. It's undefined. Try it on your calculator.
- We can talk about numbers approaching infinity using a concept called limits, and that's a useful tool in maths to work things out.
- The symbol was invented by the English mathematician John Wallis in 1655.
- Some numbers, known as irrational numbers, can't be represented as a fraction. They require an infinite number of decimal places to be completely defined. Examples are pi (Symbol π. We pronounce it as "pie" but it's actually pronounced "pee" in modern Greek.) Even some rational numbers such as 1/3 require an infinite number of decimal places to be completely defined 1/3 = 0.3333... with 3 recurring.