2. Value prop not lined up with our market's needs (cf #1)
3. Poor outreach to our market (cf #1)
4. Not enough hours in the day to build and maintain the product while trying to correct 1-3.
And so forth.
Best of luck with your effort, still. If you're still involved with MathZoom, try pitching it to the people who run it to see if they might be able to find a way to use it. That might be one of your best bets for uptake.
What went wrong with it:
1. Lackluster, non-technical co-founder.
2. Value prop not lined up with our market's needs (cf #1)
3. Poor outreach to our market (cf #1)
4. Not enough hours in the day to build and maintain the product while trying to correct 1-3.
And so forth.
Best of luck with your effort, still. If you're still involved with MathZoom, try pitching it to the people who run it to see if they might be able to find a way to use it. That might be one of your best bets for uptake.