In the mathematical field of topology, the Alexandroff extension is a way to extend a noncompact topological space by adjoining a single point in such a way that the resulting space is compact. It is named for the Russian mathematician Pavel Alexandrov.
A number of findings in topology are named after Pavel Alexandrov. OPTIONS:
- Yes
- It's impossible to say
- No
A: It's impossible to say

Tight is the debut album by the American rock band Mindless Self Indulgence. The album was originally released on April 20, 1999 through Uppity Cracker Recording Group. After having been out of print for many years, the album was reissued as Tighter on April 26, 2011 through The End Records. The reissue features updated artwork and packaging, 12 previously unreleased tracks, and a bonus DVD.
The 1999 release features a dozen fewer songs than the 2011 release. OPTIONS:
- Yes
- It's impossible to say
- No
A: Yes

Sebastian Philip Bierk (born April 3, 1968), known professionally as Sebastian Bach, is a Canadian heavy metal singer who achieved mainstream success as frontman of Skid Row from 1987 to 1996. He continues a solo career, acted on Broadway, and has made appearances in film and television.
Sebastian Bach has been a solo artist OPTIONS:
- Yes
- It's impossible to say
- No
A:
Yes