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# Calculus Summer Assignment

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

Jul 4, 2017

#1
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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.

Jul 4, 2017
#2
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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".

Jul 4, 2017
edited by Alan  Jul 4, 2017
#3
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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
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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
#5
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Ok thanks Alan, that is all I got out of it too, I thought I may have missed something but I guess I didn't.

Melody  Jul 5, 2017