User:Boris Tsirelson/Sandbox1

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The graphical user interface started.

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The source file is read.

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Definitions are processed; the formulation of the first lemma is being processed.

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The formulation of the first lemma is processed; the goal is pending.

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At last, a really serious lemma.

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The goal.

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"We have", why?

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Here is why!

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Really complicated arguments...

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Happy end is coming.

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The theorem is proved.

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Some options of the Proof General.

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Isabelle, show us your methods...

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