# Posts by Category

## Properties of the Riemann Integral

6 minute read

Theorem 6.1.9 Let $f:[a,b]\to\mathbb{R}$ be a bounded real valued Riemann integrable function with $Range f \subset [c,d]$. Let $\varphi:[c,d]\to\mathbb{R}$ ...

## Riemann Integral

7 minute read

Definition (upper sum, lower sum) Let $[a,b]$ with $a<b$ be a closed and bounded interval in $\mathbb{R}$. By a partition of $\mathscr{P}$ of $[a,b]$ we m...

## Intermediate Value Theorem for derivatives

2 minute read

Theorem 4.2.13 (Intermediate Value Theorem for derivative) Let $f:I\to\mathbb{R}$ be differentiable function on the interval $I=[a,b]$. Then given $a,b\in I$...

## Mean Value Theorem

5 minute read

Definition 5.2.1 Let $E\subset \mathbb{R}$ be a set and let $f:E\to\mathbb{R}$.

## Differentiation

3 minute read

Definition 5.1.1 Let $I\subset \mathbb{R}$ be an interval and let $f:I\rightarrow\mathbb{R}$ be a function. Fix a $p\in I$. The derivative of $f$ at $p$ is ...

9 minute read

5 minute read

Lemma 1

3 minute read

## Sequences of real numbers

5 minute read

Theorem 2.1.3 (Triangular inequality) For $\forall x,y\in \mathbb{R}, |x+y|\leq |x|+|y|$

4 minute read

## Probability Space

2 minute read

The sample space $\Omega$ is the set of all possible outcomes of an experiment. Points in $\omega \in \Omega$ are outcomes or realizations.

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## Closed Sets and Limit Points

1 minute read

Definition (Closed) A subset $A$ of a topological space $X$ is said to be closed if the set $X-A$ is open.

4 minute read

## Fundamental Theorem of Linear Algebra

5 minute read

Notation Let $$\mathfrak{B}=\{\mathbf{v}_1, \ldots, \mathbf{v}_n \} \text{ is a basis for } V.$$ Define a function \([\cdot]_{\mathfrak{B}}:V \rightarr...

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## Group and Ring

4 minute read

Definition 1 $\cdot: G\times G \to G$ is binary operation where we write $x\cdot y =xy$ for $x,y\in G$. $(G,\cdot)$ is group if it satisfies the followings ...

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## Group and Ring

4 minute read

Definition 1 $\cdot: G\times G \to G$ is binary operation where we write $x\cdot y =xy$ for $x,y\in G$. $(G,\cdot)$ is group if it satisfies the followings ...

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## Lebesgue Integration

3 minute read

Proposition 8.2.6 Let $\Omega$ be a measurable set, and let $f: \Omega\rightarrow [0,\infty]$ and $g: \Omega\rightarrow [0,\infty]$ be non-negative measurabl...

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