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+# Lecture 1 - What is computation ?
+
+Computers does 2 things only:
+- Calculate
+- Remember Calculations
+
+Computational problem solving & Computational complexities
+
+From Ambigous problem statement to computational formulation of a method
+
+Declarative vs Imperative Knowledge
+Declarative: Like an axiom - Statement of Facts
+Imperative: Like an algorithm - Sequence & Flow control - Computations
+
+John Von Newmann & Alan Turing
+Fixed program computer(Arithmetic logic Unit) - 1941 - Atanasoff & Berry
+Manchester Mark 1 - University of Manchester
+Stored program computer
+Interpreter for instrutions - Now computers can program themselves
+
+Flow control, Flowcharts
+Programming Langs
+
+Church-Turing Thesis - Defines the concept of Computability - The Nature of Computation
+Lambda calculus - Computable and effectivelly calculable
+if solvable by algo solvable by turing machine and vice versa
+Universality of Computation
+
+Halting problem - if you can prove a program will run forever or not ? no said Turing
+
+Low lvl vs High lvl
+Interpreted vs Compiled
+
+Syntax, Static sementics (syntatical validity), Sementics(meaning)
+
+Turing: We can compute anything using 6 primitives
+Read, Write, Move Left, Move Right, Scan, Do nothing
+
+Using Tape he showed can compute anything
+modern langs evolved from primitives
+
+primitives -> expressions -> values ->  meaning
+
+Primitve constructs(Syntax):
+- English: Words
+- Prog langs: Numbers, Strings, Simple operators
+
+Static Sementics (Invalidity):
+- English: I are hungry
+- Prog langs: 3+"hi"
+
+Sementics
+- English: more than one meaning
+- Prog langs: only one meaning
+
+Everything in Python is an object:
+- Scalar(int,float,bool(true/false),None,str)
+- non-scalar(type())
+
+<expr> = <var>
+
+x % y = Remainder when x/y
+x ** y = x to power of y
+
+# Lecture 2 - Branching and Iteration
+
+== vs = comparaison vs assignement
+
+a variable is just a name, object can be assigned to more than 1 var
+can assign multiples var in one line <><>=<><>
+
+Operators can be combined to form expressions, the value of the expression is an object of some type()
+
+## Arithmetic Operators
+- +  : Addition
+- -  : Subtraction
+- *  : Multiplication
+- /  : Division
+- %  : Modulo (remainder)
+- ** : Exponent
+- // : Floor division
+
+## Comparaison Operators - Compare 2 value and return true or false
+- == : Equal to
+- != : Nor equal to
+- >  : Greater than
+- <  : Less than
+- >= : Greater than or equal to
+- <= : Lesser than or equal to
+
+## Assignement Operators - Assign value to var
+- =  : Assignement
+- += : Addition assignement
+- -= : Substraction assignement
+- *= : Multiplication assignement*
+- /= : Division assignement
+- %= : Modulo assignement
+- //= : Floor division assignement
+- **= : Exponentiation assignement**
+
+## Logical Operators - To combine conditional statements
+- AND
+- OR
+- NOT
+
+## Bitwise Operator - Operate on Binary numbers
+## Membership Operator - Check if value is part of sequence
+- in
+- not in
+## Identity Operator - Check if 2 object refer to the same memory location
+- is
+- is not
+
+Variables can't start with a number
+Variables are case sensitive
+Keywords(reserved words) can't be used
+Identatation sementically meaningfull
+
+Strait Line Programs VS Branching Programs (ex: with conditional expresion)
+
+
+slicing = sequence[start:stop:step]
+'abc'[:] = 'abc'[0:len('abc')]
+
+when convert float to int : truncated not rounded
+
+fstring - to format strings
+
+f"Hello {name}, you are {age} yrs old"
+can include any expression in bracket
+f"The area of a circle with radius {sum(radius)} is {math.pi * radius}"
+
+## Conditional Statement
+- if : execute if true
+- if, elif, else
+
+## Looping Statement
+- for - Iterate over a sequence
+- while - Repeat a block of code as long as condition is true
+
+# Control statement
+- break - exit current loop
+- continue - skip rest of current iteration and follow to the next iteration in loop
+- pass - null does nothing
+
+range(start,stop,increment)
+
+PEP8 - https://peps.python.org/pep-0008/
+
+# Lecture 3 - String Manipulation, Guess and Check, Approximations, Bisection
+
+Algo:
+- Guess and check - exhaustive enumeration
+- Bisection Search - a example of succesive approximation method
+- Approximation - most common: Newton-Raphson Method
+
+# Lecture 4 - Decomposition, Abstraction, and Functions