Why Does 0.1999… Equal 0.2 Exactly? (7.4.25)

How Can We Construct Two Functions from Z to Z That Are Onto but Not One-to-One? (7.4.21)

How Can We Always Find a Rational Number Between Two Given Rationals? (7.4.17)

How Does the Tangent Function Establish a Bijection Between (0,1) and ℝ? (7.4.13)

What One-to-One Correspondence Shows ℤ⁺ and ℕ₀ Have the Same Cardinality? (7.4.9)

(7.4.5) Do the sets 25Z and 2Z have identical cardinality despite different structures?

(7.3.25) Does f∘h = g∘h with h Injective Always Imply f = g for Functions?

(7.3.21) How to Prove That If g∘f is One-to-One, Then f Must Be One-to-One

(7.3.17) How Can We Prove That a Function Composed with Its Inverse Yields the Identity Function ?

(7.3.13) Do G(x) = x^2 and G^-1(x) = sqrt(x) Form Inverse Functions for x Greater Than 0?

(7.3.9) What Is (G∘F)(x) When F(x) = x²/3 and G(x) = ⌊x⌋ for Specific Values of x?

(7.3.5) Does Composing f(x) = -x with Itself Yield the Identity Function?

(7.3.1) Are the Compositions G∘F and F∘G Equal for Given Functions f and g?

(7.2.57) How to Design an Algorithm to Check if a Function is Injective?

(7.2.53) Is f(x) = x/(x² + 1) a One-to-One Correspondence Over ℝ→ℝ?

(7.2.49) Is the Function G(x) = 2 − 3x Bijective with Inverse G⁻¹(y) = (2 − y)/3 ?

(7.2.45) Is H(n) = 2n a One-to-One Correspondence with Inverse H⁻¹(m) = m/2?

(7.2.41) How to Prove f(f⁻¹(B)) = B When f Is Onto?

(7.2.37) Is the Sum of Onto Functions f and g Necessarily Onto?

(7.2.33) Does log_b(x/y) Equal log_b(x) − log_b(y) for All Positive x, y, and b ≠ 1?

(7.2.29) Does H(x, y) = (x + 1, 2 − y) Have Both Injective and Surjective Properties Over ℝ²?

(7.2.25) Is the Concatenation Function C(s) = as Injective or Surjective?

(7.2.21) Is the Length Function Injective or Surjective When Mapping Binary Strings?

(7.2.17) Is f(x) = 3 + 1/x One-to-One Over ℝ Without Zero?

(7.2.13) Is h(x) = x² Injective or Surjective Over Unrestricted vs. Restricted Domains?

(7.2.9) How to Define Functions Between Sets X, Y, and Z w/ Injectivity and Surjectivity Properties

(7.2.5) Which Statements Incorrectly Conflate Function Definition with Onto?

(7.2.1) Why Are the Two Definitions of One-to-One Functions Logically Equivalent?

(7.1.53) Are There Infinitely Many Integers Where Euler’s Totient Function φ(n) Is a Perfect Square?

(7.1.49) Is f(f⁻¹(C)) ⊆ C True for All Functions f and Subsets C?

(7.1.45) If C ⊆ D, Does f⁻¹(C) ⊆ f⁻¹(D) for All Functions f?

(7.1.41) If A ⊆ B, Does f(A) ⊆ f(B) Hold for All Functions f?

(7.1.37) Is the Function f(n) = n² Well-Defined for Integers from -2 Billion to 2 Billion?

(7.1.33) Why Is the Function G(m/n) = m − n Not Well-Defined for Rational Inputs?

(7.1.29) How Is the Hamming Distance H(10101, 00011) Calculated?

(7.1.25) How Do Projection Functions P1 and P2 Extract Coordinates from A×B?

(7.1.21) How Does log_b(1/U) = -log_b(U) Follow from Logarithmic Definitions?

(7.1.17) How Do Logarithmic Statements Like log₂(8)=3 Relate to Exponential Equations?

(7.1.13) Are the Functions f(x) and g(x) Equal Modulo 5 for All x in J₅ ?

(7.1.9) How Does the Divisor Sum Function s(n) Behave for Different Positive Integers?

(7.1.5) How Does the Identity Function Map Symbolic Integer Inputs Like e, bᵢⱼₖ, K(T), and uₖⱼ?

(7.1.1) How to Determine Domain, Codomain, and Range from a Function's Arrow Diagram?

(6.3.49) Can the Symmetric Difference A Δ Aᶜ Equal the Universal Set U?

(6.3.53) Can the Identity A ∪ (A ∩ B) = A Be Derived Using Universal Bound and Distributive Laws?

(6.3.41) How Can the Expression A ∩ (((B ∪ Aᶜ) ∩ Bᶜ)) Be Simplified Using Set Laws?

(6.3.37) Can the Set Identity ((Bᶜ ∪ (Bᶜ − A))ᶜ) = B Be Proven Algebraically?

(6.3.33) How Do You Algebraically Prove (A−B)∩(A∩B)=∅ Using Set Laws?

(6.3.29) How Do You Correctly Prove (A∪Bᶜ)−B = (A−B)∪Bᶜ Using Set Laws?

(6.3.25) Does Every n-Element Set Have Equal Even and Odd Subsets for n ≥ 2?

(6.3.21) How Do You Disprove P(A × B) = P(A) × P(B) with a Counterexample?

(6.3.17) How Do You Prove P(A) ⊆ P(B) Given A ⊆ B?

(6.3.13) How Do You Disprove A ∪ (B − C) = (A ∪ B) − (A ∪ C) with a Counterexample?

(6.3.9) How Do You Prove A ∪ B ⊆ C, Given A ⊆ C and B ⊆ C?

(6.3.5) How Do You Disprove A − (B − C) = (A − B) − C with a Counterexample?

(6.3.1) How Do You Find a Counterexample to Disprove A ∪ (B ∩ C) = (A ∪ B) ∩ C?

(6.2.41) How Do You Prove ∪(Aᵢ − B) = (∪Aᵢ) − B for All Sets Aᵢ, B?

(6.2.37) How Do You Prove (C - A) ∩ (B - A) = ∅ Given B ∩ C ⊆ A?

(6.2.33) How Do You Prove A ∩ Bᶜ = ∅ Given A ⊆ B Using Contradiction?

(6.2.29) How Do You Prove (A - C) ∩ (B - C) ∩ (A - B) = ∅ Using Contradiction?

(6.2.25) What Logical Flaw Arises When Proving (A - B) ∪ (A ∩ B) ⊆ A?