User:Boris Tsirelson/Sandbox1

The graphical user interface started.

(CC) Image: Boris Tsirelson
The graphical user interface started.

The source file is read.

(CC) Image: Boris Tsirelson
The source file is read.

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

(CC) Image: Boris Tsirelson
Definitions are processed; the formulation of the first lemma is being processed.

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

(CC) Image: Boris Tsirelson
The formulation of the first lemma is processed; the goal is pending.

(CC) Image: Boris Tsirelson
At last, a really serious lemma.

(CC) Image: Boris Tsirelson
The goal.

(CC) Image: Boris Tsirelson
"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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...and your term bindings...

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...and the theorems.