An intriguing phrase.
Partly happy because it is the same as it ever was, and partly sad because it is the same as it ever was."
A mathematical model?
Partly happy because it is the same as it ever was, and partly sad because it is the same as it ever was.
Is it possible to model this saying mathematically? How would you?
“Partly happy because it is the same as it ever was, and partly sad because it is the same as it ever was.”
WHY would you?
Curiosity:
Binary State Model
Define two emotional states:
H : Happiness, triggered by “it is the same as it ever was.”
S : Sadness, triggered by the same phrase.
Let X be the state of the world (“it is the same as it ever was”).
Then:
P ( H | X ) > 0
P ( S | X ) > 0
Meaning: The probability of being happy or sad, given the state X , are both nonzero.
In short:
Modeled mathematically, this phrase is a beautiful example of how the same input can yield multiple, even contradictory, outputs—a concept that appears in probability, logic, psychology, and philosophy.
“Partly happy because it is the same as it ever was, and partly sad because it is the same as it ever was.”
“Ambivalence” is most commonly used in psychology and everyday language to describe mixed feelings, the mathematical modeling of ambivalence appears in several fields, often under different names or formalizations. Here are some ways this concept is represented mathematically:
Probability & Decision Theory
Mixed States/Probabilistic Preferences:
In decision theory, agents may have probabilistic (not deterministic) preferences, reflecting uncertainty or ambivalence between choices. For example, a probability vector P = ( p 1 , p 2 ) where neither p 1 nor p 2 is 1 or 0 models ambivalence between options.
- Fuzzy Logic
Fuzzy Sets:
Rather than binary true/false, elements can partially belong to sets (e.g., “happy” at 0.7, “sad” at 0.4), directly modeling ambivalent or overlapping states.
- Quantum Mechanics
Superposition:
A quantum state can be in a superposition of basis states (e.g., both “on” and “off”), analogous to being in two emotional states at once.
- Game Theory
Mixed Strategies:
Players may randomize between strategies, not fully committing to one—a kind of strategic ambivalence.
- Psychometrics & Social Sciences
Ambivalence Indices:
There are mathematical indices to measure ambivalence in survey data, e.g.:
Ambivalence = ( P + N ) 2 − | P − N |
where P = strength of positive feeling, N = strength of negative feeling.
- Emotional Response Function
Let’s define an emotional response function E ( X ) :
E ( X ) = α ⋅ H ( X ) + β ⋅ S ( X )
where H ( X ) and S ( X ) are the “happiness” and “sadness” functions triggered by X , and α , β ∈ [ 0 , 1 ] are the weights for how strongly you feel each.
For your phrase:
X = “the same as it ever was”
Both H ( X ) > 0 and S ( X ) > 0
So your emotional state is a mixture, not pure happiness or sadness.
- Ambivalence as Overlap
Let’s define the set of triggers for happiness as A , and for sadness as B :
X ∈ A ∩ B
That is, “the same as it ever was” is in both sets, so it causes ambivalence.
- Temporal Model
Suppose happiness and sadness are functions of time and change:
Let f ( t ) be the state at time t .
If f ( t ) = f ( t − 1 ) for all t , then the world hasn’t changed.
Define:
H ( f ( t ) − f ( t − 1 ) ) = h 1 if f ( t ) = f ( t − 1 ) (happy for stability)
S ( f ( t ) − f ( t − 1 ) ) = s 1 if f ( t ) = f ( t − 1 ) (sad for lack of change)
So both can be nonzero for the same condition.
- Summary Table
Condition Happy Sad
It is the same as it ever was Yes Yes
It is NOT the same as it ever was ??? ???
You feel both emotions simultaneously for the same reason.
- Philosophical/Mathematical Principle
This is a classic example of emotional superposition:
The same state ( X ) can evoke multiple, even opposing, emotions ( H , S ).
- In Equation Form
Emotion ( X ) = Happy ( X ) + Sad ( X ) , X = “the same as it ever was”
with both terms nonzero.
Summary Table of Mathematical Analogs
Field Mathematical Concept Ambivalence Modeled As
Probability Probability vector Uncertainty/mixed preference
Fuzzy Logic Membership values Partial belonging/overlap
Quantum Physics Superposition, amplitudes Simultaneous states
Game Theory Mixed strategies Indecision/randomization
Social Science Ambivalence index formula Measured conflicting attitudes
Data References and Further Reading
Fuzzy set theory
Ambivalence index
Mixed strategies in Game Theory
Superposition