CUHK MATH Bridge number
Tie me up, Tie me down
 
Equivalence
Trefoil
Figure Eight
Whitehead
Trivial Knot
Perko Pairs
 
Classifications
Torus Knots
Alternating Knots
 
Invariants
Crossing number
Bridge number
Unknotting number
Tricolorability
Linking number
Polynomials

Bridge Number

The Bridge Number of This Knots is 2
You can NOT leave a knot above or below the plane, otherwize, the bridge number=1 for all knot
Guess the bridge number of this knot!

(a) 1 (b) 2 (c) 3

Guess the bridge number of this knot!

Answer

More Examples I would like to try other examples on classifications of knots.
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