### Questions (26)

 7 Prove that there are no integers $x$ and $y$ such that $3x^2=13+4y^2$ 3 If $P(X \geq a) =1$, then $E[X] \geq a$ proof 3 $y \leq x \leq y \implies x = y$ 2 Substituting $y^2$ in a differential equation 2 image of a piecewise function

### Reputation (321)

 +15 If $P(X \geq a) =1$, then $E[X] \geq a$ proof +5 Proving properties of set complements +5 Equilibrium point of a linear system of DE's +5 Prove that this expression is real and positive

 1 How to solve $x \times 0 = n$ where $n$ does not equal $0$? 0 Find the force of gravity ?! (Calculus) 0 How long will it take to learn algebra 1 & 2, geometry, and pre calculus? 0 Why does the integration function map the polynomial vector space to the real vector space?

### Tags (33)

 1 algebra-precalculus × 3 0 derivatives × 3 0 proof-writing × 8 0 ordinary-differential-equations × 2 0 functions × 4 0 real-numbers × 2 0 calculus × 4 0 modular-arithmetic × 2 0 elementary-set-theory × 3 0 abstract-algebra × 2

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