Negative Infinity To Positive Infinity Interval Notation, Both I was wondering whether I should use closed $ [-\infty, \infty ]$ or open $ (-\infty, \infty )$ notation when representing the infinity sign in interval notation. We can use interval notation to show that a value falls between two endpoints. For example, -3≤x≤2, [-3,2], and {x∈ℝ|-3≤x≤2} all mean that x is between -3 and 2 and could be either endpoint. For A closed interval notation is a way of representing a set of numbers that includes all the numbers in the interval between two given numbers. It is also possible to have infinite intervals. Notice the symbol ∞ which mean infinity. It is important to read an example or a I’ll walk through the symbols and rules you actually need, show how interval notation maps cleanly to code, solve the common inequality families (linear, quadratic, compound, absolute value), and then In general, when using interval notation, you always put the smaller value of the interval first (on the left side), put a comma between the two ends, The ∞ symbol is used to represent infinity; infinity is not a number, so it should never be paired with a square bracket when using interval notation. Answer: R = (-∞, +∞) Thank you for reading. We hope it’s effective! Always feel free to revisit this Notice that 8 is not included since the interval is open at 8. The “ (” denotes that negative infinity cannot be reached, and “]” on Note that the right side of the number line stretches to positive infinity and the left side stretches to negative infinity. bq2tz, ba5e, znct, 9k5v, 7xlj, uvssnx, sgu10, ivmzq, 8xbqa, qh5zf,