Compostion of Functions

Duration: 5 min

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Module outline

  1. About Course: About the Course
  2. Paper-2 | Programming & Data Structures: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  3. Paper-2 | Databases / DBMS & SQL: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, SQL, Relational Calculus, Transaction Management, Concurrency Control
  4. Paper-2 | Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos
  5. Paper-2 | Computer Networks & Security: Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware Basics, Network Access Technologies, Network Security
  6. Paper-2 | Digital Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Floating Point Rep
  7. Paper-2 | Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, Disc Scheduling, File Management
  8. Paper-2 | Theory of Computation: Introduction to TOC, Deterministic FA (DFA), Non-Deterministic FA, Regular Expressions, Grammar, Regular Language Properties, Moore & Mealy Machines, Pushdown Automata & CFG, Turing Machines
  9. Paper-2 | Computer Organization & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Pipelining, Instr Formats & Modes, Control Unit Design, Programming the Basic Computer
  10. Paper-2 | Compiler Design: Intro to Compilers, Lexical Analysis, Grammar & CFG, Syntax Analysis: Top-Down, Syntax Analysis: Bottom-Up, Semantic Analysis & SDT, Intermediate Code Gen, Code Optimization, Run Time Environment
  11. Paper-1 | General Awareness: Polity, Physics, Biology, Chemistry, Static General Knowledge, GK- Current Affairs, History, Geography, Indian Economy, Environment
  12. Paper-1 | Logical Reasoning: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Data Interpretation, Blood Relations, Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Clock, Calendar, Cubes & Dices, Directions (Direction Test), Analogy, Seating Arrangements, Analytical Reasoning (Counting Figures Reasoning)
  13. Paper-1 | Quantitative Aptitude: Ratio and Proportion (Ratios), Mixture and Alligation, Permutation and Combination, Number System, HCF LCM, Speed Time and Distance, Average, Age Problems, Percentage, Profit and Loss, Time and Work, Pipe and Cistern, Simple Interest and Compound Interest, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Probability, Statistics, Arithmetic, Algebra
  14. Paper-1 | English: Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Construction, Cloze Test (Cloze Passage)
  15. Coal India Previous Year Paper:
  16. Engineering Mathematics: Set Theory, Relations, Functions, Graph Theory, Group Theory, Propositional and Predicate Logic, Linear Algebra, Calculus
  17. Coal India Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video provides a comprehensive introduction to function composition in mathematics. The instructor begins by defining the operation formally, explaining how two functions f and g combine to create a new function h where h(x) = g(f(x)). Visual aids are used extensively, including a diagram illustrating the flow from set X to Y and then to Z. The lecture transitions into practical application by working through a specific example involving finite sets of ordered pairs. The instructor demonstrates how to compute the composition g o f step-by-step and visualizes the mapping process. Finally, the property of associativity is introduced as a fundamental characteristic of function composition.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The session opens with a slide titled Function composition which defines the operation as taking two functions f and g to produce h such that h(x) = g(f(x)). The instructor explains that g is applied to the result of f. A diagram displays three sets labeled X, Y, and Z with arrows indicating mappings f: X -> Y and g: Y -> Z. To clarify the process, the instructor writes f(x) = y and g(y) = z on the screen, showing that the final output is g(f(x)) = z. This section establishes the theoretical foundation and the sequential nature of the operation, emphasizing that the output of the first function becomes the input of the second.

  2. 2:00 – 4:56 02:00-04:56

    The instructor shifts to specific formulas, displaying fog(x) = f(g(x)) and gof(x) = g(f(x)). He then presents a detailed example: Composition of functions on a finite set. He defines f = {(1, 3), (2, 1), (3, 4), (4, 6)} and g = {(1, 5), (2, 3), (3, 4), (4, 1), (5, 3), (6, 2)}. He calculates the composition g o f = {(1, 4), (2, 5), (3, 1), (4, 2)}. To reinforce this, he draws a mapping diagram with sets X, Y, Z and connects the elements to show the path from input to output. The lecture concludes by stating that composition is associative, noting that f o (g o h) = (f o g) o h. He underlines the final set of ordered pairs to highlight the result.

The video effectively bridges the gap between abstract definitions and concrete calculations. It starts by establishing the notation and flow of function composition using set diagrams and algebraic expressions. It then solidifies understanding by applying these concepts to a finite set example, explicitly calculating the resulting ordered pairs. The instructor's use of mapping diagrams helps visualize how elements traverse from the initial domain through intermediate sets to the final codomain. The inclusion of the associativity property ensures students understand the algebraic rules governing these operations, providing a complete overview of the topic. The progression from definition to example to property creates a logical learning path for mastering function composition, ensuring students can both define and compute compositions accurately.

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