Comment: "The picture of him is taken from a stamp issued by the Hungarian Post Office to celebrate the centenary of his death. It is not believed to be authentic and no authentic picture exists." cited from J J O'Connor, E F Robertson: János Bolyai, The MacTutor History of Mathematics archive, March 2004
Public domainPublic domainfalsefalse
Dette verket er falt i det fri i Noreg, og dei landa som har opphavsrettsleg vernetid på 70 år etter opphavsmannen sin død, eller kortare.
For å kunne lagres på Commons må verket både være offentlig eiendom i USA og i opphavslandet. Vernetiden kan i noen tilfeller være lengre enn 80 år i USA, så i tillegg til dette merket trengs det et eget merke som forklarer hvorfor verket er offentlig eiendom (public domain) i USA. Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Jamaica has 95 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Honduras has a general copyright term of 75 years, but it does implement the rule of the shorter term. Copyright may extend on works created by French who died for France in World War II (more information), Russians who served in the Eastern Front of World War II (known as the Great Patriotic War in Russia) and posthumously rehabilitated victims of Soviet repressions (more information).
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
The picture is from [1]. The "Copyright information" at the bottom of the page says: "We believe that most of the images are in the public domain"
which is good enough for me.
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