Math paper with no "Conclusions"

Is it acceptable for a math paper to have no concluding section? The structure is currently as follows:

1. Introduction (known results + the paper's main results as 3 theorems)


2. Preliminaries (proper definitions of all the things and recalling of results used in the proofs)


3. Proofs (actually, several lemmas and proofs of them, and of the theorems)


4. Open problems

It's quite a short paper. I thought that since the Introduction is actually containing all the important stuff, making a Conclusions section would be only repeating the same stuff again. However, I'm not sure if this is considered a poor style in maths.