The negation of that expression is: ∼∃x(D(x) → (C(x) ∧ F(x))) But that form has the negation of a quantifier ∼∃x(...) and you're asked to come up with an equivalent expression that doesn't have any such thing. That's where your negation-of-a...
1 Answers · Science & Mathematics · 13/05/2019
How could you get less than 20 if you have a positive number added to 20 lol??? Note it is greater than _or equal to_ 20, not just greater.
2 Answers · Science & Mathematics · 26/02/2019
Note that 3n^2 + 101n ≤ c(2n^2 − 19n + 20) is equivalent to (2c - 3) n^2 - (19c...3. We see that c = 131/3 suffices, by examining the plot (note that the curve is above the horizontal axis for all n ≥ 10): https://www...
2 Answers · Science & Mathematics · 17/02/2019