continuity of |f| and its f
86327
If the absolute value of a function is continuous, is the function continuous?
154363
Prove that $\text{aff}(X) = \text{aff}(\text{closure}(X))$
142220
$\forall$ At the beginning or at the end?
142459
Continuity of a Function in Terms of Closure and Interior
62334
Continuity and Joint Continuity
104263
How to show that $f'(x)<2f(x)$
100187
Show function is continuous at origin
97619
Which function ($f$) is continuous nowhere but $|f(x)|$ is continuous everywhere?
102315
difference of uniform continuity and continuity of map
125745
continuity of power series
105700
Proving $\,f$ is constant.
145017
Example of a function $f$ which is nowhere continuous but $|f|$ should be continuous at all points
157603
Continuity $\iff$ Preimage is closed whenever set is closed
125811
Recognizing special cases of a defined function for permuted arguments
14830
A transformation of F[x]
149095
$f(\mathbb{R}\setminus \mathbb{Q}) \subseteq \mathbb{Q}$ and $f(\mathbb{Q}) \subseteq \mathbb{R}\setminus \mathbb{Q}$ imply that $f$ is not continuous
71049
Functional equation $f(xy)=f(x)+f(y)$ and continuity