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.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.
Excellent attitude! Welcome to the forum!
Bob (in the prime of my life)
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Welcome to the forum!
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.
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
The knowledge of some things as a function of age is a delta function.