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1h
comment Could some one please explain how to make sense of this theorem intuitively?
If $v$ what? The question is only half written...
2h
revised Call a subset A ⊆ ℝ left-infinite if either A = ℝ or A = (a, ∞) for some a ∈ ℝ.
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2h
answered Call a subset A ⊆ ℝ left-infinite if either A = ℝ or A = (a, ∞) for some a ∈ ℝ.
1d
comment What functions satisfy this functional equation?
That does not show that those are all the solutions. Still, a +1 from me since OP is asking for a solution, not all solutions.
1d
revised What functions satisfy this functional equation?
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1d
comment Why does implicit differentiation work on non-functions?
@It is very typical in analysis to write $f(x,y) = 0$ and then looking at the implicit function $y=y(x)$ defined by this equation. There is nothing silly going on here.
1d
comment Why does implicit differentiation work on non-functions?
@Kainui He is not mistaken. $y$ is an implicit function of $x$. Your comment is incorrect.
1d
answered Why does implicit differentiation work on non-functions?
1d
comment Book for practice
Ask your professor what he recommends. At my university, we have books for each of the topics you listed, written by the professors themselves so we can be sure they fit the curriculum.
1d
revised Sum of the infinite series $\frac16+\frac{5}{6\cdot 12} + \frac{5\cdot8}{6\cdot12\cdot18} + \dots$
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1d
awarded  real-analysis
1d
comment Computing RREF on matrix with variables in coefficients
What have you done so far? What is the definition of RREF?
1d
comment How many different groups?
@Z453211 I can forgive people for being beginners. I cannot and will not forgive people for being lazy. lmgtfy.com/?q=group+multiplication+table
1d
comment How many different groups?
@Z453211 In that case, for groups od size $4$, you can simply try to write all possible multiplication tables.
1d
comment How many different groups?
@Z453211 have you heard of Lagrange's theorem? en.wikipedia.org/wiki/Lagrange's_theorem_(group_theory)
1d
answered How many different groups?
1d
comment $p ⇒ (q∨r) ≡ (p∧(\neg r)) ⇒ q$ are logical equivalent?
I know. And my answer tells you how to do it: 1) keep trying 2) verify your steps using truth tables.
1d
answered $p ⇒ (q∨r) ≡ (p∧(\neg r)) ⇒ q$ are logical equivalent?
1d
answered Definition of continuity
1d
answered is growth of x+sin(x) same as x?