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A theoretical framework extending quantum mechanics into spaces with more than three spatial dimensions, investigating how wavefunctions, operators, and measurement behave in higher‑dimensional settings. It is essential for string theory, where particles are vibrations in a 10‑ or 26‑dimensional space, and for theories of quantum gravity, where the fabric of spacetime may have extra quantum dimensions. The theory also explores exotic possibilities: quantum entanglement across hidden dimensions, higher‑dimensional analogs of quantum fields, and the stability of atoms in worlds with different numbers of dimensions.
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