Your friend is wrong about the double-slit experiment and math in black holes. The answer to your question depends entirely on what you mean by “subjective” and “objective” and I’m not sure you know what you mean. So try to tell us what you mean by these terms.
Your friend is wrong about the double-slit experiment and math in black holes. The answer to your question depends entirely on what you mean by “subjective” and “objective” and I’m not sure you know what you mean. So try to tell us what you mean by these terms.
Better still, try to tell us what you mean without using those terms.