The Scottish philosopher David Hume critiqued science, pointing out that science had basic assumptions.
There are three main assumptions of science, Hume says:
- One is that the present and future will behave like the past.
2. The second is that we have impressions of causation that we see in the world cause and effect.
3. And the third is that we can reason from effects that we perceive to the causes that produce those effects.
The author of the blog post I was reading about this said this as if it were a bad thing. But this is because we have our heads firmly up our asses. We keep looking for absolute truths and absolute surety, both of which do not exist and never will.
All fields of endeavor have foundational assumptions, so what? The question is “are they reliable/consistent?”
As to “the present and future will behave like the past” this has been tested over and over and over and over. It is a common assumption and if it is not correct, it would be noted. Since this assumption is highly trusted, it just means that many alternatives other than a disjunct from this would be considered before we consider a “violation” of this assumption. Consider Cosmic Inflation. This principle was invented because the Big Bang Theory didn’t work. So it was postulated that not only was space expanding as part of the Big Bang, but it expanded at a crazy high rate early on (even before the BB). So the expansion began crazy fast and then slowed to a more sedate pace. In other words, the universe behaved differently in the past than now. (This is, I consider, a very weak point in BBT because the reasons for the rapid expansion and the slowing are more than a little vague. And, of course, they detected that the expansion is accelerating again, now. Sheesh. And many people gloss over the claims because they say that this expansion of space only occurs between the galaxies, not within!)
Think of assumptions as “things to try first,” their only weakness is if you forget you have made them. In logic the surest way to get an argument to conclude as you wish is to get the conclusion accepted as a premise for your argument, like a forgotten assumption. Theists often do this in arguments for the existence of god. Here is an example:
Argument from Contingency
- All contingent things have an explanation for their existence
- If the universe has an explanation of its existence, that explanation is God
- The universe is a contingent thing.
- Therefore, the universe has an explanation of its existence.
- Therefore, the explanation of the existence of the universe is God.
Note that Premise #2 defines God into existence so the conclusion cannot come out that God does not exist. All the argument claims is that the universe has an explanation for its existence and that is based upon a premise that is quite unproven (and probably untrue), #1.
So, how about Hume’s second and third assumptions? Hume is using the term “impressions” philosophically, it meaning the mental constructs we make to represent what we observe in the material universe. (As if the way we think about things is a thing that has a role to play in the behavior of those things.) Again, these are reasonable starting points until they aren’t. The “law of cause and effect” was taken very, very seriously until various phenomena were observed to which it seemed not to apply. So, instead of strict causation, we switched to probabilistic approaches, determining things like “the most likely thing to happen is . . .”
Regarding Assumption #1 Hume gives an example, claiming that we have no solid rational reason for our assumption that similarity of impressions equals similarity of identity. Just because a table looks like the table that you remember seeing before is not proof that it’s the same table. Someone could have taken away the previous table, switched it with a different table, and they may look the same, but they are not the same table.
This is a specious argument. If someone were to ask me “Is that the same table as was here yesterday?” I would probably say “It looks to be so.” If they then were to say “Would you bet your life on it?” I would answer, “No that is a stupid thing to bet one’s life upon. Do you care to put up a large sum of money, instead?” Basically, if it were really, really important to answer the question “Is that the same table as you saw yesterday?” I would want to examine it closer. Looking underneath I might find my initials carved where I carved them as a boy. I might find the table makers label with my father’s handwriting showing in the phrase “Date Purchased . . .” on the label (my father did such things). But what we are coming up against is the problem of identification. How many data points would be needed to establish that the table is indeed the same table and not a clever forgery? The answer is “an infinite number.” This shows up when trying to ascertain whether two things are “identical” or not. If you kept measuring the two and the measurements turned out to be identical (within the error of measurement), at what point do you give up and say “they are identical?” You don’t because it may be the case that you haven’t yet done the measurement that shows they are not identical. So, you say something scientific: they seem to be very close to being identical. (BTW, forgers know they do not have to be the same in an infinite number of ways, only in a large number, because most people don’t check more that a few points. This is how art forgeries are pulled off (over and over and . . . ), the forgeries are only discovered when “experts” who have a larger storehouse of data points as to how the thing should look, feel, and consist of, make a larger number of measurements.)
Regarding Hume’s example, the table is a perfect exact thing, but such things do not exist in nature, only in philosophy. There is an old joke about a guy selling the hatchet that George Washington used to chop down the cherry tree. He claimed that the handle had only been replaced twice and the head once. There is a serious philosophical argument about identity which is referred to as Theseus’ Paradox, which goes like this:
The ship wherein Theseus and the youth of Athens returned from Crete had thirty oars, and was preserved by the Athenians down even to the time of Demetrius Phalereus, for they took away the old planks as they decayed, putting in new and stronger timber in their places, in so much that this ship became a standing example among the philosophers, for the logical question of things that grow; one side holding that the ship remained the same, and the other contending that it was not the same. ( Plutarch, Theseus)
Philosophers like to address absolutes, but those do not exist in nature and when they mix the two, they confuse themselves.
Once Again Republican Definitions Shatter Common Sense
Tags: corruption, Mafia Don Trump, Republicans, Trump truists
The Guardian recently published a report on Mr. Trump’s attacks upon his prosecutors. Of course, he is treating them as if they were persecutors, and thereby endangering their lives. The Guardian stated: “Trump has proclaimed he’s innocent in all these cases, and charged that the prosecutions are “witch-hunts” to hurt his campaign to become president again.”
Here is a meme running around that helps people understand the Republican notion of a Witch Hunt.
This can only be an implementation of Newspeak, an invention of George Orwell in his book 1984. Or possibly a combination of Newspeak and Humpty Dumpty speak, “When I use a word,” Humpty Dumpty said in rather a scornful tone, “it means just what I choose it to mean—neither more nor less.”