I looked at both the semantic and mathpartir package, is is possible to insert multiple inference lines in single inference rules? Or are there better ways to do this?

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The mathpartir package has a little example but it does not work very well and I can't find any better solutions.

\documentclass[12pt, notitlepage]{article}



  \inferrule {a = b \in A} {b = a \in A}$$


Here is what it produces.

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  • Welcome! Can you show us what you've tried? A minimal example starting with \documentclass and ending with \end{document} would make your question clearer and easier to answer. – cfr Dec 4 '15 at 0:13

Hard to say whether this is suitable for your use. (A minimal working example - or a non-working example showing what you've tried - would help clarify this.) But certainly ebproof allows doubled inference rules:

double trouble

\begin{prooftree}[rule style=double]
  \Hypo{ a = b \in A}
  \Infer1{ a = b \in B}

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