# Mathematical symbol for "and"

I have found some pretty complete lists (I think) of mathematical symbols here and here, but I don't see a symbol for the word "and" on either list. A person could easily just write the word "and" or use an ampersand, but I was wondering if there was an actual mathematical symbol for the word "and". Also, if anyone knows any lists that are more complete than the ones I have linked to please provide a link.

• Actually "and" is in the second link you gave us under "logical conjunction". Commented Jan 24, 2011 at 15:26
• @user3123 haha, so it is. Thanks for pointing that out! Commented Jan 24, 2011 at 15:43
• Please check the notation tag wiki for a link. Commented Jan 24, 2011 at 17:10
• It's also not uncommon to write something like "a<b,c" to indicate that "a<b and a<c". In my opinion, you should mostly write what's easiest for the reader to extract the meaning from. Commented Jan 24, 2011 at 18:54

The logical "and" is $\wedge$ (and the corresponding "or" is $\vee$).
• Especially quantors are necessary sometimes: "Let $P(x,y)$ for all $x$ and some $y$." -- very typical. English "and" is commutative, but you may not exchange (different) quantors freely. So what you often find is really awkward semi-language in order to make things clear. If you are used to formula and they are well written (which can be hard) they are not at all hard to read. In fact, I have had more "What does he really mean?" moments than "What a crazy formula!" moments. Since this is obviously a matter of taste, good authors should provide both imho, i.e. idea + precise notion. Commented Jan 24, 2011 at 21:30
• Oh, another real example: "Let $R_x$ be the right flank of the left subtree, $L_x$ accordingly." Do I have to invert both directional adjectives or just one? Commented Jan 24, 2011 at 21:34
I'll also add that, perversely, the comma can mean either "and" or "or", depending on context. For example, in classical sequent calculus, $\{ P, Q \} \vdash \{ R, S \}$ means $P \land Q \vdash R \lor S$. Also, in set-builder notation $\{ \ldots : \ldots \}$, in a certain sense, commas in the left half are disjunctions and commas in the right half are conjunctions... which is the exact opposite of $\vdash$.
The ampersand & is unmistakeable and just about right in semi-formal statements where "and" would be too wordy and a comma would be not very clear. The notation $\land$ is appropriate for formal logic, but isn't used much in general mathematics.