[justnoise]

It's mentioned briefly through a single paragraph but not much beyond that.

"He lived through the war under the name Grzegorz Krochmalny and hid in an estate near Lviv and at a manor neat Nowy Sącz. He gave private lessons in exchange for firewood, oil and milk. In his spare time he played chess and worked on designing a solar clock. During the war he resorted to solving serious mathematical equations by post but continuing his research from before the war was out of the question."