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Keyboard graph navigation: press N for concepts or E for relations; use arrow keys, Home, and End to move; Enter selects; Shift plus Enter selects and centers; plus and minus zoom; zero fits; Escape clears the selection. Use the visible viewport buttons as alternatives to dragging, wheel, and pinch gestures.
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Select any concept, construction junction, or annotated relation by pointer, touch, search, or keyboard.
Construction junctions are diamonds. They show where multiple structures must coexist on the same carrier and satisfy compatibility conditions.
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This is an authored directed relation from the source endpoint to the target endpoint.
Relation ID
e_additive_triang
Relation type
Add data add-data
Direction
source → target
Endpoint roles
source: Builds toward; target: Built from
Authored annotation
+ shift and distinguished triangles
Authored explanation
Add triangulated structure satisfying TR1–TR4.
How to interpret this relation type
Equip an existing carrier or structured object with additional chosen data, when such compatible data exists. Use a construction junction when several independently meaningful inputs must coexist on the same carrier or interact compatibly.
This is an authored directed relation from the source endpoint to the target endpoint.
Relation ID
e_derived_triang
Relation type
Induced / forgotten induced-forgotten
Direction
source → target
Endpoint roles
source: Yields by induction / forgetting; target: Obtained by induction / forgetting from
Authored annotation
retain canonical triangulation
Authored explanation
A derived category carries a canonical triangulated structure.
How to interpret this relation type
Pass canonically from a stronger object to structure it determines, or forget part of the data while retaining a valid weaker structure. The carrier may change under a canonical induced construction.