question

It;s not clear to me.
Is it some kind of mathematical instruction to students?

If these are, as one might suppose, instructions, then say:

Suppose i,j,k, and l to be fixed and omit etc...

Suppose i,j,k,l are fixed and omit their mention if they appear as indices.

What do you mean by 'omit their mention'? You need to say this part another way.

Hello Clive.

I'd taken the two verbs to be s second-person imperatives.

Can you be saying that the correct second-person imperative form is Suppose i,j,k,l are fixed - let us suppose that i,j,k,l are fixed?

Can you be saying that the correct second-person imperative form is Suppose i,j,k,l are fixed - let us suppose that i,j,k,l are fixed?

Sure, sounds fine to me. Not to you?
Clive

Thanks, I want to say we will not write them when they are indicies. what is the best way to say?

Thanks, I want to say we will not write them when they are indicies. what is the best way to say?

Suppose i,j,k,l are fixed. Do not write them when they are indices.

Hello Clive.

It sounds fine, but I'm not sure that it means what ????? ????? wants it to mean:

I was drawing a distinction between these two:

Suppose i,j,k,l to be fixed - ie. you must suppose them to be fixed.
Suppose i,j,k,l are fixed - ie. if we suppose that they are fixed.

The first is an imperative in the language of Maths pr

I'm not sure I see the distinction. Both versions sound like imperatives to me.

I'm not very familiar with the language of math problems.