Syllogism

A syllogism is a kind of logical argument in which one conclusion is inferred from two or more premises of a specific form. — Wikipedia

According to Wikipedia (and propositional calculus), all the following are invalid inferences.

All humans are mammals.
No cats are humans.
Hence, no cats are mammals.
(AEE-1)

Some humans are not male.
All fathers of humans are humans.
Hence, all fathers of humans are not male.
(OAE-1)

No humans are reptiles.
No cats are humans.
Hence, all cats are reptiles.
(OOA-1)

A few other resources agree with this.

However, introducing my Indonesian teacher. He believes that all of the above three syllogisms are valid (but wrong), while propositional calculus states that the above three are invalid.

Also, here’s another:
All Indonesians are humans.
All humans are mammals.
Hence, some mammals are Indonesians, given that the set of Indonesians is not empty.
(AAI-4)

Propositional calculus agrees that it’s valid, but my teacher basically rejects everything not in Format 1 (major MP, minor SM, conclusion SP).

I never know that the concept of syllogism is heavily different between Indonesian and math. English and math both agree on the given concept of syllogism as in Wikipedia, right? I’m pretty sure all other languages do the same (at least Greek does). Why Indonesian has an insane syllogism rules is beyond my comprehension. Or maybe not Indonesian, but this Indonesian teacher; after all, all Indonesian sources I’ve read also state the same thing, only my teacher differs.

Sooner or later I might as well ditch Indonesian language. Seriously. Either it’s illogical or my teacher is illogical.

Math camp indeed brings mental pressure

As in, I got home this Sunday. Because of some weird event that made me stayed up until 4.30 AM, I didn’t go to school on Monday. And guess what when I came back to school yesterday.

Speedster Emblem

I finished the first two pages of emblems (the games high-scorers emblems) of Mario & Sonic at the Winter Olympic Games for NDS. Yay. Took me like two weeks to figure out that boosting multiple times quickly gives you faster speed than boosting multiple times with delays in Supersonic Downhill. That also explains why I kept finding opponents at 22.100 seconds while my record was 22.300 seconds. 😦

Now I need to figure out how to get 2700 meters in Rocket Ski Jumping… Like, opponents get 2700 pretty common, while my record is 2400.

Unrelated:
You’re waiting for Monopoly report? The English Native teacher got substituted for unknown reason, so no Monopoly today 😦 But for some reason we were able to play it on the “Tutor Time” one hour before school ends.

Three vs one is impossible to win if you’re the one with bad luck. Like, you went around the board for the first time, without landing on any unbought property. 😦 Then there are three people making an agreement, like immunities and trading properties without anything in return. $4,500 + three pawns = triple purchase ability. Versus a single player with bad luck. 😦 😦 😦

Monopoly House Rules

I started to go crazy over Monopoly since…uh…5 days ago when my English “Native” teacher (which is actually from Bandung anyway) had the theme about negotiation and brought up Monopoly.

There are a lot of house rules in Monopoly, starting from the perhaps-most-common no-auction rule, to the unlimited buildings, to the weird “no collecting rent in Jail”. Before knowing the actual rules, I even went as far as “Free Parking grants you the ability to move your piece anywhere, getting the $200 salary if it’s in the first half of the board (it’s going past Go right?).”

Yeah, they are all wrong. But even then, I feel the actual rules pretty constricting. Like, you can’t trade anything other than cash, properties, and Get Out From Jail card. Nah, it’s no fun without alliances and betrayals. (Too many The Mole craze, seeing my next game on AoPS is The Mole.) So expect some weird rules to be reported (hopefully) when I play Monopoly against my classmates in 2 days (in the same English “Native” class)…

Limits

Yay first post about my school

So we learn limits in math class now. As I expected, the teacher didn’t explain properly (like the concept was kinda off), so almost everyone* didn’t understand and asked everyone who understood.

* All except me and one other person, obviously besides the teacher