United States · 1895-1969
Elbert Frank Cox
Elbert Frank Cox was mathematician and professor. He became the first African American known to earn a doctorate in mathematics.
Biographical and historical reference works document Elbert Frank Cox’s role and the mathematical work summarized on this page.
3-5, 6-8, 9-12, College
The person and the work
Biography
Elbert Frank Cox was mathematician and professor associated with United States. He became the first African American known to earn a doctorate in mathematics.
His long teaching career helped build mathematical opportunity at historically Black universities. Together, these contributions connect algebra and functions and geometry and measurement to the working problems, tools, and questions of the period.
Mathematical contribution
What this hero added or preserved
Core mathematical work
He became the first African American known to earn a doctorate in mathematics.
Method, teaching, or application
His long teaching career helped build mathematical opportunity at historically Black universities.
Why this matters
The larger lesson
Elbert Frank Cox shows that mathematics grows through proof, calculation, observation, design, teaching, or careful records. The lasting lesson is that algebra and functions and geometry and measurement can turn a difficult question into a method another person can inspect and reuse.
Place the work in time
Timeline
- 1895
Life and working period
Elbert Frank Cox worked as mathematician and professor in United States.
- Legacy
Lasting mathematical connection
His long teaching career helped build mathematical opportunity at historically Black universities.
Key idea
An equation balances two descriptions
Elbert Frank Cox’s work shows how symbols can represent an unknown quantity while preserving equality.
In 9x + 7 = 43, subtracting 7 and dividing by 9 gives x = 4.
Try it yourself
Solve the equation
Solve 9x + 7 = 43.
- Subtract 7 from both sides.
- Divide both sides by 9.
- Substitute the result to check.
Show the answer
x = 4.
Math at work
Scientists and astronomers use the same habits
Scientists and astronomers use algebra and functions to plan, compare, test, or communicate decisions. Elbert Frank Cox’s work provides a historical example of that connection.
Keep curiosity alive
A little-known fact
His long teaching career helped build mathematical opportunity at historically Black universities.
Elbert Frank Cox matters because of only one famous formula or anecdote.
The documented record is broader: He became the first African American known to earn a doctorate in mathematics.
Keep exploring
Connected learning paths
Practice these ideas
- Pre-AlgebraBridge arithmetic and algebra with integers, ratios, and equations.
- Algebra IPractice equations, variables, functions, ratios, and inequalities.
- Algebra IIWork with quadratics, polynomials, systems, and sequences.
- GeometryExplore shapes, angles, area, perimeter, volume, and classification.
- Advanced GeometryPractice coordinate geometry, transformations, vectors, and solids.