View source for Three types of investigation

The '''three types of investigation''' (Tib. དཔྱད་གསུམ་, [[Wyl.]] ''dpyad pa gsum'') refer to the process of determining the validity of a scripture<ref>Translation from: Douglas S. Duckworth, ''Mipam on Buddha-Nature, The Ground of the Nyingma Tradition'', p.221n55</ref>.
# the demonstration of what is evident (''mngon gyur'') is not invalidated by [[direct perception]] (''mngon sum''),
# the demonstration of what is hidden (''lkog gyur'') is not invalidated by [[inference]] (''rjes dpag''),
# the demonstration of what is extremely hidden (''shin tu lkog gyur'') is not contradicted (internally) by previous or later statements.<ref>The third point is sometimes abbreviated as the criteria of ''scriptural authority''. See '''Mipham Rinpoche:''' ''The Adornment of the Middle Way'', p.393, n115.</ref>

from '''[[Mipham Rinpoche]]''', ''[[Words to Delight My Teacher Manjughosha]]''<ref>'''Mipham Rinpoche:''' ''The Adornment of the Middle Way'', p.375: "But here we have the perfect teachings of the Tathagata, excellent in their beginning, middle, and end. These are like gold that is smelted, cut, and polished; they can withstand threefold examination and are not faulted by perception, inference, or verbal inconsistency."</ref>

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