$X\cup_f Y = (X\amalg Y)/\{f(A)\sim A\}$
This is the definition of adjunction space in Wikipedia. I wasn't able to understand some signs: $/$ and $\amalg$. What do they mean?
Thanks.
$X\cup_f Y = (X\amalg Y)/\{f(A)\sim A\}$
This is the definition of adjunction space in Wikipedia. I wasn't able to understand some signs: $/$ and $\amalg$. What do they mean?
Thanks.
The question is solved as in the comments.