New posts in soft-question

Pick the right notation for calculus!

How do I know what we already know in a proof when the assumptions we can use are even more complex?

How can I prove that starting from $0$, and repeatedly taking $+10,-10,\times10$ or $\div10$, requires at least $9$ operations to get to $2019$?

Online Courses open to all [closed]

How to assess a non-natively english speaking high-schooler's mathematical ability?

A layman's motivation for non-standard analysis and generalised limits

Is the number 8 special in turning a sphere inside out?

How can one visualize a homomorphic mapping.

Recommendations for Intermediate Level Logics/Set Theory Books

Any surviving contemporary manuscripts by ancient mathematicians?

Is there a simple geometric example of unequal left and right cosets?

Where to learn advanced integral calculus?

How do I find the original paper of each famous theorem?

Suggest some "unconventional" books on probability & statistics

Why is the dot product of two vectors defined the way in which it is? [duplicate]

Ideas for a present to my topology teacher

The perception of mathematics

Differentiation under (measure theoretical) integral sign

Why is the graph of the implicit relation $\sin(x^2+y^2) = \cos(xy)$ so cool?

Graduate level elementary logic books