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seen Nov 6 at 13:33

Sep
26
comment Is there a conventional symbol for the set of real algebraic numbers?
Following the comment from YiorgosS.Smyrlis, I suppose I could use 𝔸 for the reals and 𝔸(i) for the complex case.
Sep
26
comment Is there a conventional symbol for the set of radical expressions?
Thanks @JoseArnaldoDris. Now I need to find a Windows machine to look at that site… (It says Linux is an unsupported platform!)
Sep
26
comment Proof that if an algebraic integer is rational, it is integer?
Beware that 𝔸 denotes the algebraic numbers (roots of polynomials with integral coefficients) rather than the algebraic integers (which is the subset where the polynomial is also monic, i.e had leading coefficient 1). The latter set might be denoted as something like "𝔸*", but I'm not sure of what conventions exist.
Sep
26
asked Is there a conventional symbol for the set of radical expressions?
Sep
26
comment Is there a conventional symbol for the set of real algebraic numbers?
Thanks. @EulCan: As suggested, I would define my notation, but I'd prefer to follow an existing convention if one exists.
Sep
26
comment Is there a conventional symbol for the set of real algebraic numbers?
Thanks. @YiorgosS.Smyrlis: So 𝔸 is sometimes used for the real, and sometimes the complex case? I wasn't aware of that.
Sep
26
asked Is there a conventional symbol for the set of real algebraic numbers?
Feb
14
answered Equidecomposability of a Cube into 6 Trirectangular Tetrahedra
Jan
16
awarded  Commentator
Jan
16
comment Why do some people use $+\infty$ instead of $\infty$?
I wrote some notes on $\infty$ that might be of interest at rhubbarb.wordpress.com/2009/04/08/notions-of-infinity
Nov
27
awarded  Editor
Nov
27
asked Number rings and (round) parentheses versus (square) brackets
Nov
7
comment Software for drawing geometry diagrams
This is very expensive. A free, partial-alternative is wxMaxima. andrejv.github.io/wxmaxima/screenshots.html
Aug
29
awarded  Tumbleweed
Aug
28
comment Distinguishing equality and isomorphism as relations
You might also consider that a set (with some structure) might be isomorphic to itself via some mapping other than the identity (corresponding to the equality relation). Sets-with-structure may be (self-)isomorphic in more than one way.
Aug
28
comment Relation: pairwise and mutually
Here's a link to a relevant Wikipedia section: en.wikipedia.org/wiki/Mutual_independence#More_than_two_events
Jan
18
awarded  Teacher
Dec
31
answered Fun but serious mathematics books to gift advanced undergraduates.
Dec
31
comment Fun but serious mathematics books to gift advanced undergraduates.
+1 for Wilf, but almost -1 for Conway (although other works by Conway are definitely worth investigating).
Dec
31
comment Fun but serious mathematics books to gift advanced undergraduates.
+1 for Concrete Mathematics. This is an extraordinary and wonderful book.