Schröder-Bernstein Theorem
The Schröder-Bernstein theorem for numbers states that if
then
For Sets, the theorem states that if there are Injections of the Set
into the Set 
and of into , then there is a Bijective correspondence between and (i.e., they are Equipollent).See also Bijection, Equipollent, Injection- Bridge Knot
- Bridge Number
- Bridge of Königsberg
- Brill-Noether Theorem
- Bring-Jerrard Quintic Form
- Bring Quintic Form
- Brioschi Formula
- Briot-Bouquet Equation
- Brocard Angle
- Brocard Axis
- Brocard Circle
- Brocard Diameter
- Brocard Line
- Brocard Midpoint
- Brocard Points
- Brocard's Conjecture
- Brocard's Problem
- Brocard Triangles
- Bromwich Integral
- Brothers
- Brouwer Fixed Point Theorem
- Browkin's Theorem
- Brown Function
- Brown Numbers
- Brown's Criterion