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In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value. For instance:

The rain in plainSpain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value. For instance:

The rain in plain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value. For instance:

The rain in Spain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

2 added 2 characters in body; edited title
source | link

Can a proposition change it'sits truth value?

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value for. For instance:

The rain in plain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

Can a proposition change it's truth value?

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value for instance

The rain in plain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

Can a proposition change its truth value?

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value. For instance:

The rain in plain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.

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1
source | link

Can a proposition change it's truth value?

In Anthony Kenny's a New History of Philosophy he says

According to a modern conception of the nature of the proposition, no proposition can be at one time true and another time false

However my understanding of propositions is that some of them can change their true value for instance

The rain in plain falls mainly on the plain

is true (for the sake of argument) at all times. However

Today it is raining

might be true on the 18th May 2014 but false the day afterwards. So it's truth value can change.

So what have I done wrong? Have a misunderstood the nature of a proposition or truth value? Or is there more than one 'modern conceptions' of a proposition?

As ever, many thanks for everyone's expertise.