Background of my question is the following: I have found a solution for my question [Smoothness Conditions for Planar “Mock-parametric” Spline Interpolation](https://mathoverflow.net/questions/271043/smoothness-conditions-for-planar-mock-parametric-spline-interpolation) and while developing the solution, I encountered aspects of spline interpolation that I haven't seen documented:

* calculation of interpolating splines via an iterative formula, that would also allow the calculation of splines from point-sequences that are infinite in both directions
* a general solution for optimizing linear functionals on interpolating splines

now, as I am no professional mathematician and haven't published anything yet, I would like to communicate my results in a lightweight process, which would mean giving enough detail to make my findings checkable and applicable.

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> **Question:**
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> is acceptable to make an online publications sketchy, i.e. providing arguments instead of proofs, in first version and, to deliver what is missing in later editing e.g. upon feedback?
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I'm thinking about putting the results on arXiv, but I would also be happy to put them on MO in a CW contribution; direct communication to interested people would also be an option to me.  

Any suggestions in that respect are welcome