Gertie wrote
Sorry that's not good enough. As far as I'm concerned you lose any warrant to make claims about ''we'' and ''us'', if you don't even assume I exist as anything beyond your experience of me.
That is why you should distinguish between knowledge claims and ontological state of affairs claims. You can't slide between the two or ignore the difference. You can't buffer your own interpretation of your experience with what I say about mine, and still place me as just another part of your experience.
But this concern about my experience of you is not a point of concern regarding phenomenology. It is a given that there are other people, other things, for this is the way the world presents itself. The matter of showing what this is about, explaining "otherness" is not one that cancels out otherness, it is about explaining it.
If you have a hard time regarding the assumption that others exist at all, the problem you are dealing with is not the phenomenologist's, but the analytic philosopher's! Read Quine's theory of Radical translation and the indeterminacy of language. there is this paper written by David Golumbia that puts Quine and Derrida (the infamous denier of objective knowledge) on fairly equal footing regarding knowing others and other things. This issue rises up across the board and it has never, nor will it ever be resolved. Read Wittgenstein's Tractatus: It is simply absurd to think, he says, that you can extract knowledge claims' content from the logic that is used to construct it. Rorty, the same. Dewey, the same. All Kantian on this simple matter: talking about "out there" is simply nonsense. (Of course, in the post Heideggerian world, there is extraordinary work with this idea).
Phenomenology, Heiedegger's and others', simply accepts that there are others, trees, chairs, people, for this is what is presented to us in the world. It does get a bit odd, but it goes like this: I know there is a world around me, and there are things and people that are there, and not me, but "me" here is defined phenomenologically, that is, as an entity that puts the stamp of "mine" and "me" on things that are contained within the "my" of being. Other things, people, are other, and I take them in
through my dasein, personal human agency of in-the-worldness. You are clearly there and you have an agency like mine, an in the worldness. In fact, a big complaint about Heidegger is that his views of others are so strongly averse to what others do to one's own dasein: they keep questions at bay while encouraging dogmatic conformity to "the they". H thematizes the inauthenticity of existing this way, this going along with others, being blindly led and never realizing the freedom of one's authentic existence: standing before the future, unmade, and bringing forth existence out of the endless possibilities that lie in waiting out of one's personal and cultural history.
Matters of solipsism and idealism don't come up but objects are simply there, forged out of experience (see Dewey's Art as Experience and Experience and Nature), and the idea and the sense impressions are of-a piece. things are not "out there", as some metaphysical assumed things, and discovered; rather their meanings are made when we take them up. We are passive and inauthentic if we simply move anonymously through affairs. But to be a creator and make one's own life from the stand point of freedom, the present, where choices are made. Another "petty" (like solipsism) issue is freedom: how to address determinism. Freedom does not hang on such a problem. It is there, in the affairs we encounter. I am not a tree or a stone; I make my own "essence" though choice (or, I become very tree-like if I just never raise questions. Sartre called this bad faith). Determinism contra freedom is pseudo problem; there is choice, which arises when questions are put to things. I can sit here and write or jump out the window. The fact that choice does not occur ex nihilo is obvious. Choice is defined phenomenologically, not in intuitive apriority (causality).