Here are some useful tips on postings.

If one enters this code

Typing between the codes you can
format your post!

Using these html codes you can also get:
Superscripts: A[sup]n[/sup] gives A^{n}
Subscripts: A[sub]n[/sub] gives A_{n}
Degree sign: ° gives °
Plus-minus ± gives ±
Multiplication sign × gives ×
Imaginary ℑ gives ℑ
Real ℜ gives ℜ
Left arrow ← gives ←
Up arrow ↑ gives ↑
Right arrow → gives →
Down arrow ↓ gives ↓
Left/right arrow ↔ gives ↔
For All ∀ gives ∀
Partial differential ∂ gives ∂
There exists ∃ gives ∃
Empty set ∅ gives ∅
Nabla ∇ gives ∇
Element of ∈ gives ∈
Not Element of ∉ gives ∉
Product sign ∏ gives ∏
SUM sign ∑ gives ∑
Minus sign − gives −
Radical sign √ gives √
Infinity ∞ gives ∞
Angle ∠ gives ∠
AND ∧ gives ∧
OR ∨ gives ∨
Intersection ∩ gives ∩
Union ∪ gives ∪
Integral ∫ gives ∫
Not equal ≠ gives ≠
Equivalent ≡ gives ≡
Less than or equal ≤ gives ≤
Greater than or equal ≥ gives ≥
Subset ⊆ gives ⊆
NOT a Subset ⊄ gives ⊄