Hi. I've met a symbol like this: File:U+21DC.gif - Wikipedia, the free encyclopedia in an equation, at the end of it. In that equation, it was downwards. What is it used for? Thanks!
Hi. I've met a symbol like this: File:U+21DC.gif - Wikipedia, the free encyclopedia in an equation, at the end of it. In that equation, it was downwards. What is it used for? Thanks!
What was the equation? It might be a contradiction...
Contradiction - Wikipedia, the free encyclopedia
(see heading "Symbolic representation")
Without more context, I'm just shootin in the dark!