eli5, Graham’s Number?
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It’s an upper limit, there is a problem in combinatorics which asks “suppose you are combining things, what is the minimum number of things you need to guarantee a certain result” Now nobody know what the minimum number is but we do know it is less than grahams number. There is absolutely no way to explain how huge Grahams number is to anyone let alone a five year old. If all the material in the universe were turned into paper you don’t have enough paper to write how many digits it contains. Before you could store it in your head your brain would collapse into a black hole. There is simply no physical description that comes close. Even mathematics professionals don’t understand how big it is. They only know how to construct it.
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