@fast,
fast;132841 wrote:Supposing there are no particles and only waves, does this imply that electrons do not exist, or does it imply that the definition of the word, "electron" needs to be changed? Something exists, whether it be a particle, a wave, or something else, and we are using the word, "electron" to refer to whatever it is that exists, but if there are no particles, and if the word, "electron" includes "particle" as part of its definition, then either it's a referring term that fails to refer thus electrons do not exist, or electrons do exist but the word, "electron" has an inferior definition. I think.
The issue here is that you (and in general many) think that if an electron is a wave, it is not a particle. This is wrong: it simply isn't (necessarily) a point-particle. More generally in particle physics, a particle is a fundamental, non-divisible unit, irrespective of its spatial distribution. An electron is such a particle with characteristic charge, rest mass and spin: these are what define an electron. The fact that you can't cut an electron into two is what makes it a fundamental particle.
In response to the first post, an electron is a unit of charge, mass and spin that is observed in many experiments. The change of each in an ionised atom, or in inverse photoemission, the quantum of conductance, the photoelectric effect, etc, etc. That's about as direct as measurement of electrons gets, but is sufficient to assert their existence.
We can say more about electrons, e.g. about their density and their wavefunction. The former is indirectly observed, the latter cannot be observed but is great at predicting results of experiments. So ways of talking about electrons get ontologically less concrete the more you try to say.
Bones