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Mathematics
Quick fact
In the Poincaré disk, the 'straightest' lines are actually circular arcs that meet the boundary at right angles, and the sum of a triangle's angles is always less than 180°—famously, the bigger the triangle, the smaller its angle sum.
Why this is interesting
You’ve probably learned that parallel lines never meet. But what if they could? In a curved world, the rules change—and the Poincaré disk lets you see how.
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Subjects · study & training · careers
Choose something you are considering. FACTREE will give you a clear picture of what it contains, how its main parts connect and where it could lead.
This private catalogue connects 31 subjects, study routes and careers across six broad areas. Public Maps and learner routes remain off.
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Open a subject to see its complete shape at a glance. You can always return here and choose something else.
See what programming involves, how its main areas connect, and whether you find the knowledge interesting enough to take it further.
Structuring the Programming Map…
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Curiosity quiz
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