Let $a, b, c, d, e, f$ be nonnegative real numbers...
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Problem involving many squares and several variables.
52305
Is there a general relation between $a/b$ and $(a+c)/(b+c)$ where $a,b,c > 0 $?
156541
$a^b > b^a$ or $a^b b$ where $a,b$ are positive real numbers
101362
Let a,b,c be positive real number, proof.
106416
If $n,m \in \mathbb{N}$ then there are $c,d$ such that $cd = (m,n)$, $(c,d) = 1$ and $(m/c,n/d) = 1$.
114043
Prove the existence of a real number satisfying a property
157733
Are positive real numbers $x,y$ allowed to be taken out during this proof?
75199
$a \equiv b \pmod n$ and $c\equiv d \pmod n$ implies $ac \equiv bd \pmod n$
126202
Analysis Question Involving Real Numbers
25623
Does $\sqrt{a+b} \le \sqrt a + \sqrt b$ hold for all positive real numbers a and b?
77547
Find integers $a,b,c,d$ such that
127052
Independence of non-constant real variables
76790
Condition to guarantee $f=0$ on $[a,b]$
98496
Let $a,b \in \mathbb{Q^{+}}$ then $\sqrt{a} + \sqrt{b} \in \mathbb{Q} $ iff $\sqrt{a} \in \mathbb{Q}$ and $\sqrt{b} \in \mathbb{Q}$
120292
How to formally prove: if $d\mid da+b$, then $d\mid b$?
29935
If $a, b, c, d>0$ and $abcd=1$ prove that an inequality holds true
84313
$|f(z)|\le 1-|z|\forall z\in D$, we need to show $f\equiv 0$