Infinity appears in different contexts, with somewhat different meanings, in math; for example:* Trigonometric equations tend to have an infinite number of solutions. For instance, the equation sin x = 0 has the solution 0, but also all multiples of pi (if using radians) or of 180 degrees (if using degrees).
* If you divide by a number that gets closer and closer to zero ("approaches zero"), the result gets arbitrarily large (it "approaches infinity").
* In some areas of math, infinite sets are used.
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This one. The problem is trying to prove that a infinite number of pairs of prime numbers exist. It has recently been proved as shown by this article on nature.com. This is one of the oldest math problems in history, going clear back to the ancient Greeks.
In general, the plane is infinite in length and breadth and so infinite in area.
1,944 = 1296 x 1.5
An infinite amount because there are an infinite amount of numbers that you can keep adding to.
An infinite flat surface, or an infinite surface with zero curvature.