I was studying math and while doing some summations I made a notation and I don't know if it's valid/ correct so I was about to ask that on the StackExchange Math Community when I realized that I didn't actually know how to ask it:
Is this notation valid/correct/other for showing/expressing/other this summation?
I searched "valid notation" and "correct notation" and both seem to be right, so
1) Can I use them interchangeably? Any other option?.
About showing/expressing I've founded that at least in math, show seems to be used just to request a proof, so
2) Should I use express or other verb?
(metaQuestion: If any part of this question(not just the math one) sounds strange to you and you want to make some comment about it, I'll appreciate it too)