1. There are necessary truths.
2. These necessary truths are necessary because they cannot be any other way.
3. Their truth is thusly not dependent on contingent existents with regards either to disagreement about the truth of those statements or any conscious contingent beings existence.
a. The truth of necessary statements are not dependent on material or physical reality.
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--> Their necessary truth must be grounded in a mind or intellect because they exist separate from material reality but cannot exist ontologically on their own.
This is a restatement of it with much unwritten, I've been "debating" with the person but I've been rather foolish with my responses. A further clarification is that he is not arguing for these necessary propositions being platonic but grounded in a necessary mind, this was first mistake and he clarified that he was not arguing for platonism but rather some form of mental grounded dualism for necessary truths. Further in our debate I dipped into a position where necessary truths are contingent on or dependent on the axiomatic (logical) frameworks we possess to analyze or classify such propositions. I feel there is something wrong with any philosophical argument which argues from central truths to something we either cannot ever know or would always have its existence be indistinguishable from its non-existence or its state of affairs not having been fulfilled. I have this feeling that the argument is more language games than it is uncovering central aspects of our reality and wonder if any of you hold similar or contrary positions. A discussion of metametaphysics wouldn't be far from this.
I'll state up front that I'm atheist and thusly plagued with presuppositions that cloud my understanding but I cannot do without them because then I wouldn't have a starting point to walk from. Any comments, asking for further clarification, defending or attacking this argument and so on are hoped for.