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Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Having more than three regular convex polytypes is a property of dimensions only up to 4.

Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Having more than three regular convex polytypes is a property of dimensions only up to 4.

And more number-4 things by Saharon Shelah (presented in Twitter post by Artem Chernikov).

Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Having more that three convex polytypes is a property of dimensions only up to 4.

Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Having more than three regular convex polytypes is a property of dimensions only up to 4.

Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Closed-form formulas exist for solutions of polynomials up to degree 4, but not more than that.

Only 4 colors are required to color a map of any size, with adjacent areas being distinct colors.

Division rings over the reals have a maximum of 4 dimensions, and cannot have more.

Having more that three convex polytypes is a property of dimensions only up to 4.