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7

I'd say if an average human, using an average human brain and eye, can't figure out the pattern, that's good enough. Rabbi Asher Weiss discusses the criteria of "does an unaided human notice it?" with regards to triggering some change deep instead some semiconductor someplace that I'd never notice. He points out that I may not drag a heavy bench on shabbos ...


3

The Avnei Yashfei 30:5 writes that using a faucet does not count as using a kli since it is connected(to pipes) to the the house and has a din of being attached and cannot be considered a kli(utensil). So even turning the faucet on and off with your hands wouldn't help. Rav Eliyashiv holds this way as well and is also quoted in Ashrei Ha'Ish(Chelek 1:pg.203 ...


3

It would be at least לא תעמוד על דם רעך. And I would imagine much worse.


3

If you leave someone's front door open, and their dog runs away, that is a gramma (bava kamma 55b). If you startle someone and they bang into something and hurt themselves, that is a gramma (bava kamma 56a).


2

One classic example is person A throwing something off of a roof, and person B removing the cushion before it hits the ground. Person B performed a damage in the form of a Grama. So an everyday life example that would fit like that would be removing a safety from a device, where someone else then comes along and triggers it. A bit dated (who sees a fuse box ...


2

Rav Belsky, z"l, explicitly declares his reasoning in the letter: ...a tiny possibility of ספק is introduced so that the odds of the melocho being completed is reduced somewhat or delayed minimally. This concept has no place in Halacha. My understanding is that his reasoning is not that different from the general principle that we are not concerned with ...


1

Ramnbam Melachim 6.10 says wasting other items not just fruit trees: וְלֹא הָאִילָנוֹת בִּלְבַד. אֶלָּא כָּל הַמְשַׁבֵּר כֵּלִים. וְקוֹרֵעַ בְּגָדִים. וְהוֹרֵס בִּנְיָן. וְסוֹתֵם מַעְיָן. וּמְאַבֵּד מַאֲכָלוֹת דֶּרֶךְ הַשְׁחָתָה. עוֹבֵר בְּלֹא תַשְׁחִית. וְאֵינוֹ לוֹקֶה אֶלָּא מַכַּת מַרְדּוּת מִדִּבְרֵיהֶם Not only trees but breaking tools, ripping ...


1

So I have found a simple answer: There is a concept in halacha that "אין שליחות לדבר עבירה" because everyone is responsible to keep mitzvoth in their own right. Therefore if someone acts on his own you are not responsible. If however that person is not knowledgeable and is not familiar with halacha you could be over on "lifnei iver lo titain michshol" ...


1

Regarding human/animal power Similar to @Loewian by a regular valve the human is actually relieving the pressure that is in the pipe (so the first water that comes out is regarded as human propelled ( source)) But by an electrical valve the human is not reliving the pressure physically but it is only being caused by him (There might be an opinion that if ...


1

There's a lot of discussion whether the threshold needed to halachically connect your action to the result is higher vis-a-vis Shabbos than other halachic subjects because of meleches machsheves -- the Torah referred specifically to conscious, creative labor. Regardless, the Gemara Sanhedrin 76--78 discusses all sorts of cases of "direct" vs "indirect" ...


1

He also signed on this letter, which allows for grama devices in hospitals.


1

A "shabbos mode" oven that allows you to reset the temperature on Yom Tov after a random delay would seem to be an example. A hot water heater would not be grama because you are adding the cold water as you are taking away the hot water. There is a device that claims to allow hot water to be used on Shabbot using a "double random" method and keeping the ...


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