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15
Math.TechQA.Club
2026-04-13 06:20:00
138
Views
Are the symbols "$|$" and "$:$" in the definition of a set exactly the same thing?
Published on
13 Apr 2026 - 6:20
#elementary-set-theory
#notation
#terminology
#definition
#math-history
15.6k
Views
Understanding the definition of a multiple (double) root
Published on
10 Apr 2026 - 1:25
#real-analysis
#polynomials
#definition
#roots
99
Views
Finding $\inf([\sqrt{2},2] \cap \mathbb{Q})$
Published on
15 Apr 2026 - 9:22
#real-analysis
#definition
#supremum-and-infimum
225
Views
How do we define the tensor functor
Published on
11 Apr 2026 - 11:30
#category-theory
#definition
116
Views
Definition of Riemann-Stieltjes Integral (boundedness of integrated function)
Published on
11 May 2026 - 8:00
#integration
#definition
#stieltjes-integral
714
Views
What does it mean for a vector function to be twice differentiable?
Published on
11 Apr 2026 - 21:26
#ordinary-differential-equations
#multivariable-calculus
#definition
220
Views
Definition of $C^1$ close in Brin and Stuck's "Introduction to Dynamical Systems"
Published on
11 Apr 2026 - 12:25
#general-topology
#metric-spaces
#definition
#dynamical-systems
106
Views
Charts and atlases under "extrinsic" and "intrinsic" view
Published on
15 Apr 2026 - 2:29
#general-topology
#differential-geometry
#manifolds
#definition
2k
Views
Is the trivial ring a subring?
Published on
10 Apr 2026 - 22:58
#ring-theory
#definition
403
Views
Can piecewise linear function $[a,b]\to\mathbb R$ have infinitely many segments?
Published on
10 Apr 2026 - 17:08
#real-analysis
#terminology
#definition
787
Views
Are there any rings where $0$ has a multiplicative inverse?
Published on
15 Apr 2026 - 6:13
#ring-theory
#definition
#inverse
144
Views
Making definitions so that $\{0\}$ is not a field.
Published on
09 Apr 2026 - 16:08
#ring-theory
#field-theory
#definition
49
Views
For any $x>0$, does $|a-b| < x$ imply that $|a-b|=0$?
Published on
17 Apr 2026 - 1:36
#definition
33
Views
definition of $T^*M$
Published on
14 Apr 2026 - 7:04
#differential-geometry
#definition
#tangent-bundle
72
Views
What is the difference between $0$ and $\vec{0}$?
Published on
10 Apr 2026 - 10:38
#geometry
#definition
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