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this is just the spectral theorem for compact self-adjoint operators. may i suggest/request adding examples of applications to PDE, to better justify a stand-alone page? Mct mht 09:10, 26 July 2007 (UTC)
- Seconded. Jess_Riedel (talk) 02:52, 8 January 2021 (UTC)
Should the inline math parts be converted to latex? The way it is currently written φ (the swirly version) in the inline math parts is rendered (at least for me) as ϕ (the circle version), which is slightly confusing.83.135.41.102 (talk) 13:50, 2 September 2024 (UTC)