Combination symbol

[Myriam Abramson]

Could somebody please tell me what they use for the combination
symbol? I've used plain C(n,r) but a reviewer said they did not know
what C was. Is there something specific?

A lyx example would be nice.

TIA

[David L. Johnson]

Post by Myriam Abramson
Could somebody please tell me what they use for the combination
symbol? I've used plain C(n,r) but a reviewer said they did not know
what C was. Is there something specific?
A lyx example would be nice.

I would make it an array (a 1x2 matrix) surrounded by (). Example attached.

[Uwe Stöhr]

Post by David L. Johnson
I would make it an array (a 1x2 matrix) surrounded by (). Example attached.

You can directly enter the command
\choose
in a formula to get this.

regards Uwe

[Andre Poenitz]

Post by Myriam Abramson
Could somebody please tell me what they use for the combination
symbol? I've used plain C(n,r) but a reviewer said they did not know
what C was. Is there something specific?

Not really. Just define it somewhere and be done.

Andre'

[Micha Feigin]

If I recall the symbols meaning from my first year in uni, back when the
dinosaurs roamed the earth its

\left(\begin{array}{c}
n\\
r\end{array}\right)

(almost like (n/r) but without the fraction line)

Post by Andre Poenitz

Post by Myriam Abramson
Could somebody please tell me what they use for the combination
symbol? I've used plain C(n,r) but a reviewer said they did not know
what C was. Is there something specific?

Not really. Just define it somewhere and be done.
Andre'

[Bill Wood]

Post by Myriam Abramson
Could somebody please tell me what they use for the combination
symbol? I've used plain C(n,r) but a reviewer said they did not know
what C was. Is there something specific?

You can write it in ERT within a math environment like this:
\[ {n \choose k} \]

According to Guide to LaTeX, Kopka and Daly, 4th ed., p. 139, the
difference between doing it this way and using array structures is that
the arrays are always printed in the style and size of normal text while
the form above will have different sizes depending on context. I'm a
newbie with LyX so I have no idea how array structures play within it.
Also, Kopka and Daly state (p. 276) that the amsmath package provides
the command
\binom{over}{under}

-- Bill Wood

[Georg Baum]

Post by Bill Wood
Also, Kopka and Daly state (p. 276) that the amsmath package provides
the command
\binom{over}{under}

This is even supported natively in LyX (as well as \choose): Simply enter
\binom<space> (or \choose<space>) in any math box.


Georg