As an elderly gentleman who has decided to encourage his 'little grey cells' to become more active, I have joined your happy band in the hope of having a good workout. Currently I'm using the 'Khan Academy' site to help blow away the cobwebs but will doubtless be postings queries soon.
Much power to your elbows.
You might find that this sort of place can give you an even bigger mental workout. Welcome to the forum!
In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.
Excellent attitude! Welcome to the forum!
Bob (in the prime of my life)
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Welcome to the forum!
Character is who you are when no one is looking.
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment