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Mathematics
Tom Collinge's user avatar
Tom Collinge's user avatar
Tom Collinge's user avatar
Tom Collinge
  • Member for 11 years, 2 months
  • Last seen this week
  • Johannesburg, Gauteng, South Africa
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About

Retired IT project manager with atrophied maths degree.

Married, +2, ++5

Interests: family, bridge, gym, cooking, music, maths

Pronouns: he, his, him, and occasionally "that a$$hole over there"

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Top posts
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answer
29
How to distinguish between walking on a sphere and walking on a torus?
Dec 10, 2016
question
12
Topology: reference for "Great Wheel of Compactness"
Dec 29, 2015
question
12
Basis for Tensor Product of Infinite Dimensional Vector Spaces
Mar 6, 2015
question
11
What's an Isomorphism?
Feb 11, 2016
answer
11
Is a set without limit points necessarily closed?
Dec 17, 2015
answer
11
Linear Algebra, Vector Space: how to find intersection of two subspaces?
Apr 24, 2014
answer
11
Let $f(x)=ax^2+bx+c$ where $a,b,c$ are real numbers. Suppose $f(-1),f(0),f(1) \in [-1,1]$. Prove that $|f(x)|\le \frac{3}{2}$ for all $x \in [-1,1]$.
Apr 29, 2014
question
10
Confused about Domain of Unbounded Operators (Hilbert Spaces)
Jul 6, 2016
question
10
Why is Multiplicative Notation Used for Groups (Instead of Additive)?
Jan 29, 2015
answer
10
no. of real roots of the equation $ 1+\frac{x}{1}+\frac{x^2}{2}+\frac{x^3}{3}+............+\frac{x^7}{7} = 0$
Feb 1, 2015
Top network posts
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7
Could you see what you are typing in a Teletype?
6
What is the Orientation of the "All-Sky" Projection?
5
How were bugs reported for compilers that were shipped on floppy disks?