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In philosophy, there is much mention of the intension/extension distinction. Two properties can be extensionally equal but not intensionally equal. It is very easy to define when two properties are extensionally, but I have never seen a satisfactory definition of intensional identity. Has anyone defined it?

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    Can you mention what unsatisfactory ones you've seen and briefly explain why you find them unsatisfactory? – virmaior Oct 2 '17 at 7:40
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    It's possible for two things to be equivalent without being equal; one simple-minded definition of equivalent intensions is they give equal extensions; I'll be interested to see what answers come up - good question. – Mozibur Ullah Oct 2 '17 at 7:58
  • Have you tried with the review in SEP: Intensional Logic ? There are many references to recent developments. – Mauro ALLEGRANZA Oct 2 '17 at 13:12

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