Translate into English: ∀x ∃y (x < y), where the domain of both variables is the real numbers.
Pick an option to check yourself, or open the answer below.
Show answer & explanation
Correct answer: A. For all real numbers x, there exists a real number y such that x is less than y
Explanation
∀x ∃y (x < y): for every real x there is some real y bigger than it. The order of quantifiers matters: ∃y ∀x would claim one y bigger than every x.
More Discrete Structures and Optimisation questions
- If f(n) = 5f(n/2) + 3 and f(1) = 7, where n = 2ᴷ and K is a positive integer, then f(2ᴷ) =
- Which of the following are true if the universe of discourse consists of all integers? A. ∀n∃m (n² < m) B. ∃n∀m (n < m²) C. ∃n∃m (n² + m² =…
- Which of the following sequences aₙ are solutions of the recurrence aₙ = 8aₙ₋₁ − 16aₙ₋₂? A. aₙ = 1 B. aₙ = 2ⁿ C. aₙ = 4ⁿ D. aₙ = n·4ⁿ E. aₙ…
- Arrange the following simple graphs based on a number of spanning trees they have : A. K [Complete Graph with 3 nodes] 3 B.K [Complete Grap…
- Match List - I with List - II.
- Arrange the following sets in increasing order of cardinality: A. A₁ = {{1, 2}, {3}} B. A₂ = {{1}, {2}, {3}, {4}} C. A₃ = {{1, 2, 3, 4, 5,…