Ways to study mathematics while commuting I spend approximately 3 to 4 hours on public transport everyday. I try to maximize the usage of this time by checking email etc on my phone.
Are there any tips to study mathematics while commuting? 
Thanks for sharing! Just want to make full use of the time spent commuting!

I know this answer is a bit off-topic, but...
My friend, what you really need is to rent (buy?) an apartment in that place you're commuting to. Whatever it is you have back home - it's not worth it. You're wasting your life and ruining your health. If it's your family - ask them move with you to your commute destination, or seriously consider only coming home to them on the weekends.
If you do that, you'll be a lot less tired, a lot more focused, a lot less grumpy - and you could devote actual leisure time to studying math the usual way, whatever that may be... you could even take a university course or two and rearrange your work schedule since you'll be more flexible.
Do it. I mean it. I was in your shoes during part of my life - and in retrospect I completely regret not having done something about it.
