Relations And Functions — Revision Notes
BITSAT · Mathematics
Quick revision notes for Relations And Functions — key concepts, formulas, and definitions for BITSAT Mathematics preparation.
Revision Notes — Relations And Functions
Key concepts, formulas, and definitions from Relations And Functions for BITSAT Mathematics preparation.
Key Topics to Revise
Cartesian Product of Sets
- Cartesian product X × Y is the set of all ordered pairs (x,y) where x ∈ X and y ∈ Y
- If n(X) = p and n(Y) = q, then n(X × Y) = pq
- Order matters in Cartesian products: X × Y ≠ Y × X (unless X = Y)
Relations
- A relation R from X to Y is any subset of X × Y
- Domain of R = set of all first elements in ordered pairs of R
- Range of R = set of all second elements in ordered pairs of R
Functions
- A function f: X → Y is a special relation where each element in X maps to exactly one element in Y
- For functions: Domain = X, Co-domain = Y, Range ⊆ Y
- Vertical Line Test: A graph represents a function if every vertical line intersects it at most once
Types of Functions
- Identity Function: f(x) = x for all x in domain
- Constant Function: f(x) = c for all x in domain
- Polynomial Function: f(x) = a₀ + a₁x + a₂x² + ... + aₙxⁿ
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Key Concepts
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What topics are covered in Relations And Functions for BITSAT?
Relations And Functions is an important chapter in BITSAT Mathematics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Cartesian Product of Sets, Relations, Functions, Types of Functions.
How important is Relations And Functions for BITSAT?
Relations And Functions is a frequently tested chapter in BITSAT Mathematics. Questions from this chapter appear regularly in previous year papers. There are 60 practice questions available for this chapter.
How to prepare Relations And Functions for BITSAT?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.