New posts in definition

What does "homomorphism" require that "morphism" doesn't?

What is the square root of complex number i?

What does "approach zero" really mean?

Is the empty set a subset of itself?

Why aren't vacuous truths just undefined? [duplicate]

Standard Tic Tac Toe is -- Impartial or Partisan?

How do I interpret Euler's formula? [duplicate]

Is this modification of connexity necessary, or redundant in the definition of partial ordering?

Characterization of continuity with open subsets.

Formal definition of big-O when multiple variables are involved?

What's the name for the property of a function $f$ that means $f(f(x))=x$?

How can we come up with the definition of natural logarithm?

Is the Dirac Delta "Function" really a function?

How do you define functions for non-mathematicians?

Why do we say ‘pairwise disjoint’, rather than ‘disjoint’?

Why is $x^0 = 1$ except when $x = 0$?

Definition of definition

Showing that two definitions of $\limsup$ are equivalent

What is the exact and precise definition of an ANGLE?

Multiples are closed under integral linear combinations