Function lec# 3 part# 1| graph| internal (),[],(]| number of functions| basics| HEC USAT 2025-26|

In this lecture I’m breaking down the complete foundation of Functions in the simplest way. You’ll learn how to identify which graph is a function and which is not, the concept of intervals (open, closed, open-closed, closed-open), real numbers vs imaginary numbers, and how many functions can be formed.
This class is specially designed for HEC USAT (M/E/CS) and all other competitive exams.
If you want a strong base in mathematics, start here and don’t skip any minute.

What you will learn in this video:
• What is a function
• Vertical line test (which graph is a function / not a function)
• Real numbers and imaginary numbers
• How intervals work
• Open, closed, half-open intervals
• Number of functions and mapping basics
• Tricks you’re never taught in class

function basics, domain and range, vertical line test, interval notation, real numbers, imaginary numbers, mapping in functions, HEC USAT math, competitive exam math, function graph identification, open and closed intervals, function tricks

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