Uzanto:Salix alba/provejo

AAA <math>...

$\mathbb {C} ^{n}f(n)={\begin{cases}n/2,&{\text{if }}n{\text{ is even}}\\3n+1,&{\text{if }}n{\text{ is odd}}\end{cases}}$

BBB <math display="block">...

$$\mathbb {C} ^{n}f(n)={\begin{cases}n/2,&{\text{if }}n{\text{ is even}}\\3n+1,&{\text{if }}n{\text{ is odd}}\end{cases}}$$

CCC  :<math>...

$\mathbb {C} ^{n}f(n)={\begin{cases}n/2,&{\text{if }}n{\text{ is even}}\\3n+1,&{\text{if }}n{\text{ is odd}}\end{cases}}$

DDD