In my bullet list, is ...是个... [something]的 problematic, and do I need an "and"? From my talk's slides, I have:


  
  
  先结论...
  
  对于给定m（即为确定的元素数量），m! #PLR(r,s,n;m)是个
  - 三元多项式，
  - 对称多项式(即#PLR(r,s,n;m)=#PLR(s,r,n;m)等)，
  - 整数系数的，
  - 3m次多项式。


(I have some students here helping me debug this, but it's mostly my writing.)

I'm happy with the content, but I'm not comfortable with the grammar.  I'm concerned about two things:


A mismatch between 是个... and the third item 整数系数的 ("has integer coefficients"), but maybe this is okay.
The lack of an "and" here (we would normally include it in English).


Question: In my bullet list, is ...是个... [something]的 problematic, and do I need an "and"?
I have read the comments and reply, then I would like to give a demo in my way. We can discuss it.


  首先给出结论 （This indicate that we will prove it in later slides...）
  
  对于给定的m（即为确定的元素数量），多项式m! #PLR(r,s,n;m)具有以下特点：  
  
  
  是三元多项式，
  是对称多项式(即#PLR(r,s,n;m)=#PLR(s,r,n;m)等)， （I'm just curious, what do you mean by 等 here? Does it mean #PLR(r,s,n;m)=#PLR(r,n,s;m) and so on?）
  是整数系数多项式，
  是3m次多项式。