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0 0 0 1 1 0
0 0 0 1 0 1
0 0 0 0 1 1
1 1 0 0 1 1
1 0 1 1 0 1
0 1 1 1 1 0
Condensing it (making it so every vertex is the same) gives us this:
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0 2
2 2
What happens to an incidence matrix when you condense it?
0 0 0 1 1 0
0 0 0 1 0 1
0 0 0 0 1 1
1 1 0 0 1 1
1 0 1 1 0 1
0 1 1 1 1 0
0 2
2 2
3 | 2
--+--
2 | 3
ubersketch wrote:... but how are incidence matrices condensed?
general triangle
1 * * | 1 1 0
* 1 * | 1 0 1
* * 1 | 0 1 1
------+------
1 1 0 | 1 * *
1 0 1 | * 1 *
0 1 1 | * * 1
isoceles triangle
1 * | 2 0
* 2 | 1 1
----+----
1 1 | 2 *
0 2 | * 1
regular triangle
3 | 2
--+--
2 | 3
1 1 0
1 1 0
1 1 1
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