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#1
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Discrete math anyone
Anyone ever take a discrete math course? I'm stumped beyond infinity.
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#2
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is it linear? groups?
effin' hate that 5hit! hey... wait a second... you can't have infinity in discrete math... |
#3
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Nope. Soon as the numbers go above ten my brain shuts down.
- Peter.
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2021 Chevrolet Spark Formerly... 2000 GMC Sonoma 1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 2002 Kia Rio. Worst crap on four wheels 1981 240D 4spd stick. 389000 miles. 1984 123 200 1979 116 280S 1972 Cadillac Sedan DeVille 1971 108 280S |
#4
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Peter, take your shoes off & you will be good for 20 !!!
Don, infinity is just an 8 that fell over !!
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#5
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Yes, I took one. It was alright, it was mainly logic, and proofs of various items. Only math course I've ever gotten anything other than an A in..
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#6
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No thanks, I prefer my math to be blatant.
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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15 '06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod) |
#7
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"The law, in its majestic equality, forbids the rich as well as the poor to sleep under bridges, to beg in the streets, and to steal bread." |
#8
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its killing me. I get the idea of whats going on but dont understand how to do the proofs
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#9
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Which book are you using for logic?
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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman |
#10
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Discrete Mathmatics and Its Applications sixth edition Kenneth H. Rosen
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#11
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Hmm... never used the system. What kind of rules are you allowed so far, are you using quantifier logic, and are you allowed to use reductio ad absurdium?
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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman |
#12
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quantifiers, laws of disjuntion/conjunction
here is an in class example Prove (p → r) ∨ (q → r) ≡ (p ∧ q) → r using logical equivalence. Please the name of the laws you use. I've got no idea how to start. |
#13
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Don, I actually recognize that from over 35 years ago!! There are a series of laws, if you start with the RHS you can use the laws to change it a couple of times, you will then be able to make it look like the LHS & so proved
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#14
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yeah.. I dont follow how to actually do that. it doesnt click
so I ignore the left hand side all together and make the right look like the left.. somehow? |
#15
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Quote:
Since you are proving equivalence you need to prove on direction then prove the other. First prove [(p → r) ∨ (q → r)] -> [(p ∧ q) → r ] Assume one side of the conditional 1) (p → r) ∨ (q → r) (assumption) Now you need to prove the other side which is a conditional also. So you assume the left side of the conditional as well. Indent one time. I can't seem to do it on the forum. 2) (p ∧ q) (assumption) Now you need to prove r. 3) -r (assumption) . . . Once you've prove the above conditional you need to prove the conditional the the other way. (since p ≡ q is p -> q and q -> p right?)
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You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman |
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