Recently, I was looking for the reviews of some Analysis books while encountered terms such as Baby/Papa/Mama/Big Rudin. Firstly, I thought that these are the names of a book! But it turned out that these are some nick names used for the books of Walter Rudin. So I was thinking that
$1$. What are the corresponding books of these nick names?
$2$. Why such nick names are chosen? or What are their origins?
