Precisely Unless
If 
is true precisely unless 
, then implies not- and not- implies . J. H. Conway has suggestedthe term ``Unlesss'' for this state of affairs, by analogy with Iff.
- Sampling
- Sampling Function
- Sampling Theorem
- Sandwich Theorem
- San Marco Fractal
- Sard's Theorem
- Sarkovskii's Theorem
- Sarrus Linkage
- Sarrus Number
- SAS Theorem
- Satellite Knot
- Satisfiability Problem
- Sausage Conjecture
- Savitzky-Golay Filter
- Savoy Knot
- Scalar
- Scalar Curvature
- Scalar Field
- Scalar Function
- Scalar Potential
- Scalar Triple Product
- Scale
- Scale Factor
- Scalene Triangle
- Scaling