# Inequality Mathematical Induction Proof: 2^n greater than n^2 | Summary and Q&A

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โข
January 26, 2020
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The Math Sorcerer
Inequality Mathematical Induction Proof: 2^n greater than n^2

## TL;DR

2 to the power of N is proven to be greater than N squared for N greater than 4 through a step-by-step mathematical induction proof.

## Key Insights

• ๐งก Mathematical induction is a powerful technique for proving statements for a range of values, starting with a base case and establishing an induction hypothesis.
• โพ The base case shows that the statement holds true for the starting point, while the induction hypothesis assumes the truth of the statement for a positive integer greater than the base case.
• ๐ฐ๐ณ The induction step involves proving the statement for N = K + 1 using the induction hypothesis and algebraic manipulations.
• ๐ฏ Careful algebraic manipulations and substitution are required to establish the inequality 2 to the N > N squared, which is the core of the proof.

## Transcript

hey what's up everyone so in this video we're going to prove that 2 to the N is bigger than N squared for n bigger than 4 and we're going to try to do it with mathematical induction okay that's the rule so we can think of this as our statement right this is our our statement I'll call it S sub n and you can call it P sub n it's our statement and in... Read More

### Q: Why is the base case necessary in a proof by mathematical induction?

The base case establishes that the statement is true for the smallest integer in the range of consideration, providing a starting point for the proof.

### Q: What is the importance of the induction hypothesis in this proof?

The induction hypothesis assumes that the statement holds true for some positive integer greater than 4, which allows for the step-by-step proof for larger values of N.

### Q: How is the induction step carried out in this proof?

The induction step involves proving the statement for N = K + 1 using the induction hypothesis and algebraic manipulations, ensuring that the inequality holds true.

### Q: Why is it necessary to use the inequality 2 to the N > N squared heavily in this proof?

The inequality is crucial to the proof as it provides a basis for manipulating and comparing the terms involved, ultimately leading to the desired result.

## Summary & Key Takeaways

• The video aims to prove the inequality 2 to the N > N squared for N > 4 using mathematical induction.

• The base case is established by showing that the statement holds true for N = 5.

• The induction hypothesis assumes that the statement is true for a positive integer greater than 4.

• The induction step involves proving the statement for N = K + 1, taking into account the previous hypothesis and algebraic manipulations.

• By successfully completing the induction step, the video concludes that the original statement holds true for all positive integers greater than 4.