## "Science is the source of all other knowledge"

"Mathematics is about numbers and physics is all about mathematical functions"

## crazy Quantum mechanics + beautiful relativity = Universe (including us?)

## "All that we know from common sense are necessary mistakeno or erroneous.. "

# Theory of everything

Theory of everything is the ultimate theory of physics , that should describe all physical aspects and occurrences in a consistent manner. Such theory , if it is
found,
needs to unify all fundamental forces of nature. String theory is the best candidate for theory of everything. It is
a theoretical framework that have merged quantum mechanics with
theory of relativity. According to string theory universe has nine space dimensions and one time dimension. All the
dimensions other than three are curled up and tiny so that we can not directly perceive them. Besides this crucial feature, the principles of string theory say
that what appears to be elementary particles are
tiny vibrating pieces of strings. Somehow if we can work out resonant or vibrational pattern of the piece of string we will be able to explain the observed properties
of the elementary particles. The conclusion is that the universe is a cosmic symphony of strings resonating through ten dimensional hyperspace. What are we ? We are nothing but the melodies. We are nothing but cosmic music played on the same cosmic strings or membranes.

+
= Everything

### General advice

Readers from all over the world , have you a feeling that you are bad at mathematics? Do not fear mathematics. Once I was also a victim. You can now conquer mathematics easily. The secret is behind logic. Logical ideas alone can define mathematics.
I will state russell's paradox first. If you understand this you can safely assume that you have a good mathematical sense .

Suppose R is a set of all sets that are not members of themselves. Now is this set R is a member of itself or not? If it is a member of itself then it is one of the sets which are not members of themseves. So it is not member of itself. And if this set R is not member of itself then by definition it is a member of itself. So in either way we come to a contradiction!

This was Russell famous paradox. All mathematics are basically logical deductions. You can follow my website for more logical analysis of mathematics.

**"Universe is not what it seems to be"**

### Introduction

**The main purpose of this website is to give some basic ideas of classical physics,
quantum mechanics, relativity and quantum field theory
for those who wants to become a science major or philosopher in science.
Theories are at the heart of physical sciences and mathematics. Here most of the major and interesting theories of
physics have been discussed. Those who want to understand popular science books will get help from this website.
Some electrical and electronics engineering concepts have also been given for undergraduates of electrical engineering.
This website is not supposed to include everything. Those who are very curious to
understand scientific theories and spacetime physics in somewhat non technical way, will find this
website very usefull. So far a little subject matters have been included.
In the future more and more topics will be added. Many topics of Mathematics and its applications are also
demonstrated in a simple manner. I have already said, all physics is interpreted by mathematical functions.
The principle aim will be to justify this claim.**

# Quantum Field Theory

Feynman's sum over histories | S-matrix ! quantum field theory# Theory of relativity

Relativity made simple | Special theory of relativity | General theory of relativity | Tensor calculus | Hamiltonian mechanics | Field equation | Perihelion of mercury| Geodesic distance# Quantum mechanics

Schrodinger equation | Matrix mechanics | Dirac equationProof

In quantum mechanics operators are replacements for classical quantities like position and momentum. They are some kind of functions too.

all the physics in one equation (excluding string theory)

This is the equation which is derived in analogy with Feynman's path integral equation.

There are seven ideas that shook the universe. These are

1. Newtonian mechanics

2. Energy and entropy

3. relativity

3. quantum theory

4. conservation principles

5. copernican astronomy

6. symmetries

7. Theory of everything

**"we are all here to do what we are all here to do"**

Giving to others is a great virtue....

**"I know everything is in the mind but mind is a very powerful thing"**

## "Life is about giving and sacrificing. It is not about possessing and having.."

### quantum tunneling

**"giving to others is a great virtue.."**

Some of the revolutionary equations of physics in one package

**"what is mind never matters and what is matter never mind.."**

**"We are the children of atoms, so understand the atom if you try to understand the universe"**

## This is our universe , look for yourself. Everything from atom to galaxies, from electrical engineering to computer science, from human beings to microorganisms can be found in this grand equation. Where you go from here is a choice I leave to you.

The first equation describes the spacetime curvature that massive bodies create in the vicinity of them. It is theory of gravity according to the view of Einstein.

The fist term in the lagrangian of the second equation describes force carriers like photons. The second term describes quarks , leptons and their interactions.
The third and fourth term describe higg's particles. The fourth term including h.c(hermitian conjugate) make quark and leptons massive. First equation is the gravity.
The second equation describes all other three fundamental forces. These equations perhabs contains the very sentence that you are reading right now.

**"If you give others you only get in returns.."**

# Electrical and electronics Engineering

Integrated Electronics | Power Engineering | Telecommunication | Control System Engineering | Electronics | Fundamentals of EEE | Digital signal processing | Digital Filters | Maxwell equations | Differential equation and calculus**"God is a great mathematician"**

### Mathematics

Mathematics is the language of nature. It is hard to define mathematics . In general it is the study of change, numbers and shapes. Mathematics consists of various branches like arithmetic, geometry, topology, calculus and many more. Science can not progress without mathematics. This is so obvious fact that needs not be mentioned. Mathematics , in a certain sense , an exact science. We all accept the mathematical theorems and truth because we can prove those. we all accept 2+2 = 4. Mathematics is always flawless. That is what mathematicians thought every time. But Kurt Godel gave a death blow to mathematics by claiming that no mathematical system is complete. Axiomatic systems are necessary incomplete. That means there will always be some statement within the system , whose truth can not be proven using the system. This was very frustrating idea for the mathematical society and no one has yet been able to refute Godel's claim. This is known as the Godel's first incompleteness theorem. This theorem is kind of related to the "liar paradox" of usual language. Suppose there is a sentence " he is lying". Now if the sentence is true then when he says that he is lying , he is indeed lying. That means he is telling the truth. The sentence's truth can not be determined as we come to a contradictory situation. There are other similar paradoxes explained here.

"**Mathematics has a better sense than the common sense**"

There is hardly any branch of engineering and science where mathematics does not apply. Mathematics is a sense you never have. So nobody is gifted with mathematical ability. You can not be good at it without practising it. But it seems surprising that our mind which is so well organized can not adapt with mathematics everytime. Or may be it is a wrong idea.

** "pure mathematics is a poetry of logical ideas"**

Without speaking about numbers the importance of mathematics can not be described. To describe numbers or define numbers we need to know how to count. To count , in turn, will need three steps : 1) the idea of many-ness 2) one-to-one mapping and 3) sequentially speak or say the number words

First we need to have the idea of many-ness. We need to answer the question of how many? How many objects do we a collection have? Then we map each objects to other objects with one-to-one relation.

Mapping: mapping is assigning each element of a set to exactly one element of another set.

When we assign an element , say our finger to each element of a collection , we speak one for one finger , two for two fingers and so on to last one which will be the cardinal number of our collection or set.
Then we give a symbol for the number if we like. This symbol will represent that particular number.

The invention of calculus has changed the world. Calculus was invented by Leibniz and Newton at the same time although there is priority dispute about who invented it first. Application of calculus is everywhere. Where there is change there is calculus. Where there is curvature there is calculus. Both the theory of relativity and quantum mechanics were developed using calculus. Everybody knows that the idea of calculus is rooted in the notion of limit. When we speak about something approaching another one or some point approaching another point , the notion of limit appears. There is precise definition of limit. You can think of it as a scheme to manipulate infinite number of small quantities. We know we can sum infinite number of terms in a geometric series, which converges. Same thing happens in case of limit. One quantity converges to another and in the end they become equal. This is the core idea of limit and calculus.

Real numbers are all the numbers that can be traced on number line. It includes both rational and irrational numbers. Real number line contains no gap or it is continuous. Irrational number was defined in order to make the real number line complete. It is the set R. It is extended from - (infinity) to +(infinity) including zero. Real numbers are also called measurable numbers. It includes the set of integers too. Calculus is certainly established using the concepts of real numbers. Cantor first proved that the set of real numbers is non denumerable. It can not not put in one-to-one correspondence with natural numbers(1,2, 3, 4, 5,6 ......). Real numbers has cardinality 2^(ℵ0) , which is called cantorian continuum. Cantor also proposed that there is no set which cardinality lies strictly between that and ℵ(0). This is called continuum hypotheses. These two infinite numbers of continuum hypotheses play exactly the same role as integers 0 and 1. There is no integer in between 0 and 1. Cantor knew that this was the case but he never came up with a proof. Later Kurt Godel showed that this hypotheses is consistent with axiomatic set theory.

Pythagoras law has made a great impact on science and mathematics. This law holds for any right angle triangle in Euclidean geometry. The law says square of the hypotenuse is equal to sum of squares of other two sides. This law not only bears the fact of geometry but also laid the foundation of many scientific theories like theory of relativity and electromagnetism. Pythagoras law also states that there is a 3-tuple of integers which satisfy it. In another words there are infinite number of solutions of Pythagoras law. More specifically , there are infinite solutions for x, y and z in integers which represent the three sides of any right angle triangle. This brings us to Fermet's last theorem. The theorem states that there are no solution for x, y and z in integers for power greater or equal to 3. Proof of Farmet's last theorem took much time to be discovered. This proof involves number theory.

Gauss was perhaps one of the greatest mathematicians of all time. He was first to study the curved surfaces. What we call plane is particular cases of 2-dimensional surfaces or manifolds. In physics he contributed also. We all know Gauss's law of electromagnetism. Gauss was very talented in his early childhood. One day his teachers asked everybody in his class to add all the numbers from 1 to 100. Gauss calculated it more quickly than others within seconds. He just did it by adding two numbers and multiplying it by 50. How ? 50 pairs of numbers have the same summation like 1+99 =100 , 2+ 98 = 100, and so on.. So the total sum is 50*100 = 5000. Gauss also developed many theorems which are still very usefull.

** "Mathematics gives you wings" **

Roger Penrose is the world's leading mathematical physicist. He collaborated with Hawking and proved that time had a beginning. The proof concerns the postulates of the theory of relativity. He is a mathematician too. He is specialized in recreational mathematics. He makes many complicated mathematical problems seem easy by graphical representation. Mathematics, according to him, has certain platonic existence. There are three kinds of worlds
:one is physical world, second is mental world and the third is platonic world. Mathematical objects and forms exist in platonic world. Mathematical objects or forms are numbers,
triangles, circles, sets and many more. There is no perfect circle in real world. We can not see perfect flat space anywhere in the universe. This kind of pure mathematical or geometric
objects exist only in the platonic realm.

Our mental world consists of all our thoughts and abstract percepts. It has no connection to physical reality. Our mental world contains particular or percepts. Universals are certain concepts which can exist without our mind. Mental world does not necessarily make logic and mathematics dependent on it.

Physical world is the materialistic world that we inhabit. It is the whole universe or multiverse-as we may call it.

**
So what is the most complicated topic in mathematics? Is it topology or geometry or calculus? or is it linear algebra or
statistics? It is none. Mathematics builds upon itself. If you want to understand calculus you need to understand limit
and functions. If you need to understand topology you need to understand set theory. It is like a chain. If one link is missing the whole system is broken.
We do not understand mathematics because of these missing links. Lot of things is dependent on definitions. We can define something when there are notions
which have a certain relation to some term , which is itself one of the said notions. Why is physics hard to understand? Physics has lots of notation and
symbols which scares us away. You can talk about general relativity. In relativity all boils down to 21 numbers that Riemann curvature tensor assigns
at each event in spacetime. In classical electromagnetism at each event in spacetime there are 16 numbers that electromagnetic field tensor assigns.
How does these numbers creep in? I guess you have to have some ideas about those theories. Take another example of quantum field theory. This theory
treats particles as excitation of the fields. Everything in QFT can be thought as perturbation in an infinite number of sets of infinite number of tiny springs.
Particles come from energy that the fields represent. In quantum electrodynamics there are three functions which give
three different numbers describing all interaction between matter and radiation. I guesss I have to say that Pythagoras was right all along when he said that numbers
rule the universe. If you know only calculus well and have some basic ideas of linear algebra you can understand a lot of advanced theoretical physics theories.
**

**"If the multiverse theory is correct then there is someone exactly like you (doppleganger) which is reading this sentence in another universe!!"**

**"When you got nothing , you got nothing to loose.."**

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**"Things you own end up owning you"**

**"Mathematics may not teach us how to add love or subtract hate but it ensures every problem has a solution..."**

If you can't beat me then join me...

Miscellaneous pages

Algebra | coordinate geometry | Topology for dummies | Symmetry | Bertrand Russell philosophy | Sir issac newton | | Albert Einstein | Artificial intelligence | Leonhard Euler | Carl Friedrich Gauss | Number theory | what is science | complex analysis | perihelion of mercury | string theory explained | Calculus for dummies | Medical Science definition | Mathematical universe

Chamok Hasan Mathematics | Complex analysis

quantum mechanics and elementary physics | Mathematics (Advanced)

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Love formula

### Reference materials:

Law of thermodynamics

A briefer history of time by S. Hawking

A brief history of time by S. Hawking

Quantum mechanics

Grand Design by Stephen Hawking

Higher Engineering Mathematics ( PDFDrive.com ).pdf