Tech lookup

Syntax Cheatsheets

• AHK
  • Word of warning: indexes start from 1 in AHK
• Bash
  • chmod
  • curl
  • find
  • grep
  • List of sys info cmds
  • tee (output to STDOUT & file)
  • xxd (data to hex/bin)
    • See also Linux man page
• Network
  • General DNS cheatsheet
    • dig
    • nslookup
  • nmap
• C++
• GDB
  • GDB Peda
• Git
• Java
• LaTeX Math
  • Image to LaTeX Math
    • Mathpix
    • img2latex-mathpix
• Markdown
• PlantUML
  • Examples (Copy-able)
  • Examples (PDF)
  • Language Spec
• Vim
• Regex

Math / Probability Theory

• General

  • Khan Academy
  • Cheatsheet for Vector,Alg,Calc,Int

• Calculus (Paul's Online Notes)

  • Derivatives
    • Total Differential
    • Nabla Symbol (Differentiation of 3D vector)
    • Differentiating w.r.t a vector (video)
  • Integrals
  • Common Derivatives & Integrals
  • Summarized Cheatsheet
  • Partial Derivatives
    • Simple Explanation
    • Examples
    • Maximizing / Minimizing f(x,y)
      • See also
      • Optimizing 3 variables, See pg78
      • See MATLAB section below

• Linear Algebra

  • Cheatsheets
    • The Matrix Cookbook
    • Simple Vector Cheatsheet
    • Math54 cheatsheet
    • Eigenvalues & eigenvectors
  • Summaries (Non-glanceable)
    • Lin Alg Summary 1
    • Lin Alg Summary 2
  • Reference texts
    • Lin Alg Summary
    • Linear Algebra Abridged
    • Linear Algebra (Paul, Complete)
    • Eigenvalues & eigenvectors

• Progression / Series

  • Series
  • Arithmetic / Geometric Progression Formulae
  • Taylor Series basics

• Set Theory

  • Cartesian Product

• Wavelets

  • https://www.youtube.com/watch?v=F7Lg-nFYooU&t=0s

• Combinatorics

  • Formula Sheet 1
  • Formula Sheet 2
  • Pigeonhole Principle
  • Chapter 3

• Birthday Problem

  • Wikipedia
  • Finding k-collisions on hash function

• Probability Theory

  • Chain Rule / Conditional Probability / Baye's Thm
  • Conditional Independence
    • Bayes Net and Causal Chains
  • Optimizer's Curse
  • Maximum Likelihood Estimation

Math Tools

• MATLAB
  • Optimizing multiple variables with MATLAB fminsearch
  • Using fmincon
  • Typical Optimization Problem
  • Eqn Solver
• Wolfram Alpha
• Python symbolic math Sympy
• Graphing (Desmos)
• Calculations (Wolfram Alpha)

Infosec

• Perfect Secrecy
• Perfect Secrecy (Formal math definition)
• Perfect Secrecy of OTP
• Attack Models
• XOR (See: Important properties of XOR)
• Differential Privacy
• Perfect Hashing
  • See Also: Universal / Perfect Hashing
• RSA
• Diffie Hellman Key Exchange
• Principle of Least Privilege
• SSL
• VPN
• IPSec
• Format String Attack
• x86 Stack Layout (and Buffer Overflow mechanics)
  • x64 Stack Layout
  • Syscall Reference
  • Registers
• Signed HTTP Exchange

Algorithms

• Master Theorem
  • T(n): Total time spent by algorithm
  • n: input size
  • a: # of subproblems in the recursion
  • b: factor by which subproblem size is reduced
  • f(n): time at current level (excluding subproblems)

Formal Verification

• Verifying programs with arrays and lists

Artificial Intelligence

• AI
• Optimizer's Curse
• Finding correlations? (Unresearched Article)
  • Data Correlations & which ML models to use
• Decision Planning
  • TD lambda
• Gradient Descent
  • Video introduction
  • Ordinary Least Squares & Gradient Descent by Chayan Kathuria
• Machine Learning
  • Textbook
  • Optimizers
• Computer Vision
  • O'Reilly OpenCV
  • Homography & RANSAC
    • Lecture
    • What is a Homography
    • Understanding projective geometry & homogeneous coordinates
      • Lines & Planes
        • Easier explanation
        • Distance between 2 points (See 4:54 and general f(x) at 7:54)
        • Affine Geometry
          • Affine vectors
        • Cross Ratio ("Most important invariant in projective geometry")
          • Talking about vectors (with the same direction) as multiples of each other
          • Ratio of ratios are maintained (3:20)
    • Basics with OpenCV code
    • OpenCV documentation
    • RANSAC summary
    • SIFT
  • Optical Flow
    • OpenCV example

Tech Interview Guidebook

• https://yangshun.github.io/tech-interview-handbook/

"Code Doodle" Services

• Google Colab
• jDoodle

Pre-Commit

• Husky

Website creators

• Docusaurus

Git

• GitHub
• GitLab
• BitBucket

Post-Commit CI/CD

• Travis
• GitHub Actions

Containers

• Technologies as of Oct 16,2020,by martin heinz

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