what does this notation mean? (1 Viewer)

[bos1234]

its like a E turned around//

b E R

R is the real number.. what does the E stand for

 

[pLuvia]

I'm not sure about the latin word but it means, "for all"
So for bER it would be "b is all real numbers"

 

[modezero]

reverse E means "there exists"
upside down A means "for all"

 

[bos1234]

wait u guys are saying different things...one is saying.. there exits.. the other is saying for all...

 

[pLuvia]

Oh yeh, my bad modezero is correct

 

[acmilan]

lawl <3 logic

 

[Slidey]

(∃ε < 0)

Hahaha!

 

[Mumma]

ummm... Yes.

 

[Riviet]

(∃ε < 0)

Hahaha!

 

[Slidey]

It's an age-old maths joke; "assume epsilon < 0".

Granted, mine translates more to "assume there exists some epsiolon < 0", but either way the idiocy is inherent.

 

[KeypadSDM]

b E R makes no sense at all, unless E isn't the backwards E, but the "element of" E.

Even if you append something before the b, saying "There exists 'The Reals'" is trivially true (well nearly trivially), and more confusing that useful.

 

[Slidey]

Not knowing what it means or how to use it, he probably typed it from memory and in fact meant to type "There exists a b which is in R".