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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Help Me ! » derivatives problems » 2006-09-17 09:16:52

well you need to change the form to get it in the derivative form  - so f'(a) = (x+2) to the power of ½ so you multiply the ½  infront of (x+2)  and substract 1 from the power which would be ½(x+2) and when u substract one from the power u get -½ and do the derivative of x  would be  1 so f' = ½(x+2) to the -½ as the power *1 .  how ever i am not sure  what your limit is trying to say if u can resend the limit part clearly

#2 Re: Help Me ! » need help with discrete mathematics » 2006-09-17 04:46:45

ok this is what i have 
p⇒q and q⇒r
is quivalent to (~p or q) and (~q or r) distribution of and
= ( (~p or q) and ~q) or ((~p  or q) and r)
= ((~q and ~p)  or (~q or q)) or ((~p and r) or( q and r)
= (((~q and ~p)  or F or ((~p and r) or( q and r)
= ~p or (q and r)
= p implies (q and r)

i dont know if this is right but i tired please help me out

#3 Re: Help Me ! » need help with discrete mathematics » 2006-09-17 03:09:48

ok here is what i would on    (( p imlies q) and (q implies r)) is equivalent  to (p implies(q and r)   prove this without doing truth tables

#4 Help Me ! » need help with discrete mathematics » 2006-09-17 02:54:51

mrsesyc
Replies: 5

hello everyone, i'm new to the forum and i was wondering if anyone in here knows about logical equivalences for discrete maths since i have problem with them and im not getting by

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