#1**0 **

What is xED(f)*backwards E* f(x)=6 mean?

\(xED(f)*\ni* f(x)=6\)

\(\ni \text{ means owns, or has member} \)

ref:

https://oeis.org/wiki/List_of_LaTeX_mathematical_symbols#Relation_operators

I think this is what you are describing ?? but I don't know what it means.

Melody Jul 4, 2017

#2**+1 **

Might be:

or:

if D stands for domain, this could mean something like: "the set of x's belonging to the domain of the function f implies that there is an f(x) equal to 6".

Alan Jul 4, 2017

#3**0 **

Thanks Alan, but could you please expand upon the meaning of this. Or give an example maybe.

This is just an if/then that applies to a specific function f, isn't it?

I really do not understand well at all :(

\(x\in D(f) \cdot \ni\cdot f(x)=6\)

Melody
Jul 4, 2017

#4**+1 **

Well, I'm not sure I understand it myself!

The first part says x is a member of D(f), though we're not told what D(f) means. I guessed it means the Domain of a function f.

The backward, upper case E, means "there exists", so I simply guessed the whole thing means: if x is the set of variables in the domain of f there exists a specific value of x such that f(x) equals 6.

Still doesn't make a lot of sense though!!

Alan
Jul 4, 2017