It has the International Journal Number (ISSN) number 6697-3006

Historical question (puzzle)

Historical issue:

Residents of the Prussian city of Königsberg (currently Kaliningrad) invented a puzzle in the eighteenth century AD: Is it possible to cross all the bridges just once without repeatedly crossing any of them?

 

If you know the solution, then (scan/click) the barcode to find out the solution:

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10 + = 18