Interval Notation Explained - The Basics You NEED to Know!

Today, we're covering how to express a solution in interval notation, which is common when solving an inequality.

The interval notation has a few components - parenthesis, brackets, and the number (or infinity), separated by a comma. Parenthesis are used when the inequality symbol has either a "less than" or "greater than" sign, which is represented with an open circle on a number line, indicating that the number itself is not included. A bracket is used when the symbol is "greater than or equal to," or "less than or equal to." Infinity will always have a parenthesis, since we cannot include it - it is a concept, not an actual number.

We'll review several examples you need to know, including the union of two sets, represented by a "U," which joins two sets together, as well as the intersection, represented by an upside down "U," which only looks for the overlap between sets.

[MathGeeksAndScienceFreaks]

Want to know how to express a solution in interval notation? Here are the basics you must know!

[juliettef]

This definitely covers all the basics for interval notation

[odeabaez]

I’m learning interval notation in school. I like the examples you gave

[monicadiamond]

Thanks for teaching me how to express a solution in interval notation!

[jackiew]

Oh ! Infinity is a concept not an actual number ! I didn’t know ! So you always have to use a parenthesis ok.

[thatomofolo]

Inequality/÷[ ] < > and to infinity and beyond

[dorijaden]

Oh ok so the parenthesis are used when the inequality symbol has either a greater than or less than sign

[AlexanderBarton-lb]

Very helpful regarding the left-right rule when making the brackets

[gide]

Please look at the French way to write intervals. Much more simple, intuitive and consistent. Group of mathematicians called Nicolas Bourbaki.

[hamiltonbitches]

wow, you just saved me for my quiz tomorrow. Best explanation ever!!!

[NaderTaghinia]

Excellent style of teaching. I loved it! Thank you.

[jackwarren]

Ok I see when a parenthesis or bracket should be used now

[caryc]

Oh the union of two sets is represented by a u that makes sense

[julesl]

Interval notation seemed hard til I watched this

[wirycar]

Thank you so so much man this came in clutch i had an exam

[yeisonvillagrez]

Bro thx i missed a week of school thx to you I understand

[talifhaniedward]

How do we find the union and intersection of set and interval
e.g {1, 2, 4}u(3, 5)?

[MwendaCleophas]

Thanks for making me well understand the concept

[bulkmeup]

Thank you for the video. I was struggling with this part didn't know when to use the correct symbols you made it so clear.

[alainac.]

Thank God for youtube teachers, im sitting in class so confused and i come here n i get it