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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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#54 Re: Introductions » Glad to be back at mathisfun! » 2014-03-01 01:04:22

Hey, welcome back.  I thought it started in 2005 though, 2004??

#57 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-28 09:58:29

I'm starting
to post
words that
are not
necessarily
my favorite
sounding
words.

haust = autumn

hnerra = sneeze

fitna = grow fat

hestur = horse, pony

hjól = wheel, bicycle

flibbi = collar

meiðsli = injury

herðar = shoulders

kór = choir

bæn = prayer (I like this one, reminds me of bénit in French)

skarð = (mountain) pass

kartafla = potato

bók = book

#59 Re: Puzzles and Games » Add 14 more and post it forever » 2014-02-28 06:16:31

1274 = 14 x 91
1288 = 14 x 92
1302 = 14 x 93
1316 = 14 x 94
1330 = 14 x 95
1344 = 14 x 96
1358 = 14 x 97
1372 = 14 x 98
1386 = 14 x 99
1400 = 14 x 100
Nice place to stop.

#60 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-27 07:37:17

máfur = seagull

sparlega = sparingly

moll = minor (key in music)

þoka = fog, mist

frænka = (female) cousin

frost = frost

#61 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-27 06:38:43

kál = cabbage

löpp = paw

kisa = cat

píanó = piano

kalinn = frost-bitten

skran = rubbish

#62 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-27 06:07:22

epli = apple

soðinn = boiled, cooked

duft = powder

#63 Re: Help Me ! » Cutting a cone with a plane » 2014-02-27 05:43:28

Oh, I finally see where your 1:1.2599 thing is!!  Its the top vertical to the whole vertical!!

I was doing a ratio of the top vertical to the bottom vertical.

#64 Re: Help Me ! » Cutting a cone with a plane » 2014-02-27 05:12:59

So to get the ratio of top to bottom parts vertically,
I did 1 - (cube root of 2 reciprocalled) and put that in the
#:# where 79.3% : 20.6% and then I hit a few
buttons on my calculator and found the special 48003 eighth root thing
by hitting square 3 times.

#65 Re: Help Me ! » Cutting a cone with a plane » 2014-02-27 05:08:08

I'm doing the ratio of top to bottom.
You're doing the ratio of top to the whole thing.

#67 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-27 04:54:17

aðgæzla = care, attention

afsökun = 1. excuse 2. apology

fönn = snowdrift

för = journey

#68 Re: Help Me ! » Cutting a cone with a plane » 2014-02-27 03:49:05

setup the 2x thing, the whole cone is twice the top part or bottom part, where 0<k<1:

So I guess you go 79.37005% down from top and cut there for half volume.

The ratio of the top axis length to the bottom axis length seems to be about this, can't prove it:

#69 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-26 08:58:03

sendibað = message

peð = pawn in chess

ráðalaus = puzzled, at a loss

strax = at once, straightaway

aflangur = oblong

afklæða = undress

#70 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-26 06:55:19

misjafn = uneven, different

karl = old man

piltur = lad

mjöl = flour

orð = word

skip = ship, boat

sjaldgæfur = rare, unusual

vegna = because of, on account of

#71 Re: Help Me ! » 4 linear equations » 2014-02-26 04:22:23

Thanks a lot for the help!!!  I finally got the zero for the determinant!!  I did it by hand!!  It worked though.

#72 Re: Help Me ! » 4 linear equations » 2014-02-26 03:49:57

Do I ignore the constants on the right side of the equations and
just do a determinant of the 4x4 matrix:

#73 Re: Help Me ! » 4 linear equations » 2014-02-26 03:42:43

I'll check my work and also I didn't take the determinant.

#74 Help Me ! » 4 linear equations » 2014-02-26 03:27:16

John E. Franklin
Replies: 7

I originally thought up
these four equations
hoping they would only
meet at one point and
I could solve for it using
matrices, but down below
you can see my one
point of intersection may
have blown up to something
bigger than that.  Does
anyone know what this
bigger thing is called?  Is
the intersection bigger like
some 3-d space in 4-d, or
is it a plane in 4-d?  Or any
other interpretation is
certainly welcome...

w + 2x + 3y + 4z = 5
6w + 7x + 8y + 9z = 10
11w + 12x + 13y + 14z = 15
16w + 17x + 18y + 19z = 20

Any ideas welcome.
Your take on this
system of equations
would be very helpful to me!!

#75 Re: Dark Discussions at Cafe Infinity » icelandic dictionary » 2014-02-26 02:21:19

sýkill = bacillus

roðna = blush

bókasafn = library

happdrætti = lottery

skák = chess

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