Goursat, 
.J.B. 古尔萨（1858—1936）
- tangential property
- tangential quadrilateral
- tangential representation
- tangential sphere bundle
- tangential stress
- tangential tetrahedron
- tangential transformation
- tangential triangle
- tangential variety
- tangent indicatrix
- tangent internally
- tangent line
- tangent local charts
- tangent map (= tangent mapping)
- tangent method
- tangent microbundle
- tangent number
- tangent of a circle
- tangent of an angle
- tangentoid
- tangentoidal curve
- tangentor
- tangent osculating circle
- tangent osculating half-space
- tangent parallelogram