Timeline for What kind of matter is positronium?
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| Jan 17, 2022 at 14:34 | comment | added | anna v | @Ruslan yes, but it is a misleading use of definitions, because the hoi polloi start thinking of negative matter or questions on whether positronium .and antihydrogen are different than normal matter, they are not, they are all made of matter | |
| Jan 17, 2022 at 14:08 | comment | added | Ruslan | Your definition of antimatter as the material with negative mass seems to be uncommon. The common definition (given e.g. in Wikipedia) is the matter composed of antiparticles, and your example of anti-hydrogen is exactly an example of antimatter. | |
| Jan 17, 2022 at 7:16 | history | answered | anna v | CC BY-SA 4.0 |