"Therefore" sign

Factual Questions
1

I was asked this several days ago, and I couldn’t find an answer, and its been bugging me ever since.

As I’m sure you know, in mathematical proofs (and other places) three dots arranged in a triangle pointing up is read “therefore.”

Is there a name for that punctuation/symbol/shorthand? Is it just the therefore sign?

2

Hello, Amarinth, nice to meet you, although I wish I hadn’t read your question! It hadnt’t occurred to me before, but I don’t know a name for it either, and it’s going to bug me now. Nor do I know a name for the same symbol reversed - I hope someone clever knows both, because I can see it would be a really difficult thing to look up anywhere.

3

My Mathematics Dictionary says it means therefore or hence. But no name specifically.

“Hence Sign” is shorter, but sounds funny. (“ensign”? “head sign”?)

4

I’ll just second AWB’s post.

My type/copy editing reference sources call it a “therefore” or “hence” sign. The reverse (triange of dots, pointing down) is simply the “because” sign.

5

No, it doesn’t seem to have a name. Check it out at Symbols.com – http://www.symbols.com/encyclopedia/44/441.html

6

Hm. Symbolically speaking, how is:



                         \
 .                  ------\
. .  different then ------/
                         /

Crudely drawn if-then.
(to be distinguished from)



 /       \
/---------\
\---------/
 \       /
7

To the best of my knowledge, “Therefore” is used in mathematical formulas and proofs, and the arrow-thing (“Yields”?) is used in chemical equations.
-SSB

8

=> is a logical operator.



 .
. .

is used in proofs and theorems, usually in the conclusion.
Sorry about the formatting.

9

This is your chance at collecting the 15 minutes Andy Worhol envisioned.

Name the symbol and create a website with that name to promote its use.

Don’t be shy because you aren’t a famous mathematician.

America was not named by Columbus the discover, but by a mapmaker that saw a blank spot where a name should be.

10

Yeah, I’m using it a lot in number theory. It is:
A|B|=>

1|1|1
0|1|0
1|0|0
0|0|1

But the definition of what those two symbols “mean” seems the same
essentially, I’m wondering if I can start doing:



   .
A . . B

In number theory and comp. sci. boolean arithmetic proofs, just to be cute, or if the three dots are only allowed to indicate a finaly conclusion (sorta like the annoying use of Q.E.D.).

11

It’s always when you type it out and submit it that you notice that you changed
=>
to
<=>
by screwing up the 1s and 0s

quiet sobs
I have got to start using preview…

12

Isnt there also a symbol that is the reverse?
The triangle upsidedown to indicate “because” or something similar?